21204031434 has 32 divisors (see below), whose sum is σ = 43808294400. Its totient is φ = 6834974400.

The previous prime is 21204031423. The next prime is 21204031487. The reversal of 21204031434 is 43413040212.

It is a super-2 number, since 2×21204031434² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215592 + ... + 298140.

It is an arithmetic number, because the mean of its divisors is an integer number (1369009200).

Almost surely, 2^21204031434 is an apocalyptic number.

21204031434 is an abundant number, since it is smaller than the sum of its proper divisors (22604262966).

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

21204031434 is a wasteful number, since it uses less digits than its factorization.

21204031434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83966.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21204031434 its reverse (43413040212), we get a palindrome (64617071646).

The spelling of 21204031434 in words is "twenty-one billion, two hundred four million, thirty-one thousand, four hundred thirty-four".