21054042132 has 12 divisors (see below), whose sum is σ = 49126098336. Its totient is φ = 7018014040.

The previous prime is 21054042109. The next prime is 21054042133. The reversal of 21054042132 is 23124045012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21054042132² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054042133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877251744 + ... + 877251767.

It is an arithmetic number, because the mean of its divisors is an integer number (4093841528).

Almost surely, 2^21054042132 is an apocalyptic number.

It is an amenable number.

21054042132 is an abundant number, since it is smaller than the sum of its proper divisors (28072056204).

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

21054042132 is a wasteful number, since it uses less digits than its factorization.

21054042132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754503518 (or 1754503516 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21054042132 its reverse (23124045012), we get a palindrome (44178087144).

The spelling of 21054042132 in words is "twenty-one billion, fifty-four million, forty-two thousand, one hundred thirty-two".