1213123101 has 8 divisors (see below), whose sum is σ = 1618105824. Its totient is φ = 808444560.

The previous prime is 1213123097. The next prime is 1213123117. The reversal of 1213123101 is 1013213121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213123101 - 2² = 1213123097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213123151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66570 + ... + 82811.

It is an arithmetic number, because the mean of its divisors is an integer number (202263228).

Almost surely, 2^1213123101 is an apocalyptic number.

It is an amenable number.

1213123101 is a deficient number, since it is larger than the sum of its proper divisors (404982723).

1213123101 is a wasteful number, since it uses less digits than its factorization.

1213123101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152091.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1213123101 is about 34829.9167526998. The cubic root of 1213123101 is about 1066.5182489571.

Adding to 1213123101 its reverse (1013213121), we get a palindrome (2226336222).

The spelling of 1213123101 in words is "one billion, two hundred thirteen million, one hundred twenty-three thousand, one hundred one".