21534231054 has 32 divisors (see below), whose sum is σ = 49728542976. Its totient is φ = 6089207040.

The previous prime is 21534231013. The next prime is 21534231073. The reversal of 21534231054 is 45013243512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2638812 + ... + 2646959.

It is an arithmetic number, because the mean of its divisors is an integer number (1554016968).

Almost surely, 2^21534231054 is an apocalyptic number.

21534231054 is an abundant number, since it is smaller than the sum of its proper divisors (28194311922).

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

21534231054 is a wasteful number, since it uses less digits than its factorization.

21534231054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5285880.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21534231054 its reverse (45013243512), we get a palindrome (66547474566).

The spelling of 21534231054 in words is "twenty-one billion, five hundred thirty-four million, two hundred thirty-one thousand, fifty-four".