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21431122 = 210715561
BaseRepresentation
bin101000111000…
…0001101010010
31111022210222021
41101300031102
520441243442
62043202054
7350106256
oct121601522
944283867
1021431122
1111108579
12721632a
13459494b
142bbc266
151d34e67
hex1470352

21431122 has 4 divisors (see below), whose sum is σ = 32146686. Its totient is φ = 10715560.

The previous prime is 21431119. The next prime is 21431129. The reversal of 21431122 is 22113412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21427641 + 3481 = 4629^2 + 59^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21431096 and 21431105.

It is not an unprimeable number, because it can be changed into a prime (21431129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357779 + ... + 5357782.

Almost surely, 221431122 is an apocalyptic number.

21431122 is a deficient number, since it is larger than the sum of its proper divisors (10715564).

21431122 is a wasteful number, since it uses less digits than its factorization.

21431122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715563.

The product of its digits is 96, while the sum is 16.

The square root of 21431122 is about 4629.3759838665. The cubic root of 21431122 is about 277.7676318546.

Adding to 21431122 its reverse (22113412), we get a palindrome (43544534).

The spelling of 21431122 in words is "twenty-one million, four hundred thirty-one thousand, one hundred twenty-two".

Divisors: 1 2 10715561 21431122