21204110442 has 32 divisors (see below), whose sum is σ = 44481100032. Its totient is φ = 6730686144.

The previous prime is 21204110437. The next prime is 21204110443. The reversal of 21204110442 is 24401140212.

It is a super-2 number, since 2×21204110442² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21204110443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1005673 + ... + 1026540.

It is an arithmetic number, because the mean of its divisors is an integer number (1390034376).

Almost surely, 2^21204110442 is an apocalyptic number.

21204110442 is an abundant number, since it is smaller than the sum of its proper divisors (23276989590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21204110442 is a wasteful number, since it uses less digits than its factorization.

21204110442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032302.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21204110442 its reverse (24401140212), we get a palindrome (45605250654).

The spelling of 21204110442 in words is "twenty-one billion, two hundred four million, one hundred ten thousand, four hundred forty-two".