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123211213 = 1011219913
BaseRepresentation
bin1110101100000…
…00110111001101
322120211210000021
413112000313031
5223020224323
620120502141
73024164236
oct726006715
9276753007
10123211213
1163605454
123531a951
131c6ac758
141251408d
15ac3c05d
hex7580dcd

123211213 has 4 divisors (see below), whose sum is σ = 124431228. Its totient is φ = 121991200.

The previous prime is 123211201. The next prime is 123211241. The reversal of 123211213 is 312112321.

Adding to 123211213 its reverse (312112321), we get a palindrome (435323534).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312112321 = 1013090221.

It can be written as a sum of positive squares in 2 ways, for example, as 63952009 + 59259204 = 7997^2 + 7698^2 .

It is a cyclic number.

It is not a de Polignac number, because 123211213 - 217 = 123080141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123251213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609856 + ... + 610057.

It is an arithmetic number, because the mean of its divisors is an integer number (31107807).

Almost surely, 2123211213 is an apocalyptic number.

It is an amenable number.

123211213 is a deficient number, since it is larger than the sum of its proper divisors (1220015).

123211213 is a wasteful number, since it uses less digits than its factorization.

123211213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220014.

The product of its digits is 72, while the sum is 16.

The square root of 123211213 is about 11100.0546395052. The cubic root of 123211213 is about 497.6034824256.

The spelling of 123211213 in words is "one hundred twenty-three million, two hundred eleven thousand, two hundred thirteen".

Divisors: 1 101 1219913 123211213