21054352031 has 16 divisors (see below), whose sum is σ = 22012538400. Its totient is φ = 20111952000.

The previous prime is 21054352027. The next prime is 21054352043. The reversal of 21054352031 is 13025345012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21054352031 - 2² = 21054352027 is a prime.

It is a super-2 number, since 2×21054352031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054352001) 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, 6972440 + ... + 6975458.

It is an arithmetic number, because the mean of its divisors is an integer number (1375783650).

Almost surely, 2^21054352031 is an apocalyptic number.

21054352031 is a deficient number, since it is larger than the sum of its proper divisors (958186369).

21054352031 is a wasteful number, since it uses less digits than its factorization.

21054352031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21054352031 its reverse (13025345012), we get a palindrome (34079697043).

The spelling of 21054352031 in words is "twenty-one billion, fifty-four million, three hundred fifty-two thousand, thirty-one".