21234137204 has 24 divisors (see below), whose sum is σ = 42532754880. Its totient is φ = 9086527296.

The previous prime is 21234137201. The next prime is 21234137209. The reversal of 21234137204 is 40273143212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234137201) 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, 556937 + ... + 593840.

It is an arithmetic number, because the mean of its divisors is an integer number (1772198120).

Almost surely, 2^21234137204 is an apocalyptic number.

It is an amenable number.

21234137204 is an abundant number, since it is smaller than the sum of its proper divisors (21298617676).

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

21234137204 is a wasteful number, since it uses less digits than its factorization.

21234137204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151447 (or 1151445 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The spelling of 21234137204 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-seven thousand, two hundred four".