21354554331 has 24 divisors (see below), whose sum is σ = 33982781040. Its totient is φ = 12814008000.

The previous prime is 21354554323. The next prime is 21354554339. The reversal of 21354554331 is 13345545312.

21354554331 is a `hidden beast` number, since 2 + 135 + 455 + 43 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (21354554323) and next prime (21354554339).

It is not a de Polignac number, because 21354554331 - 2³ = 21354554323 is a prime.

It is a super-2 number, since 2×21354554331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21354554339) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1057836 + ... + 1077833.

It is an arithmetic number, because the mean of its divisors is an integer number (1415949210).

Almost surely, 2^21354554331 is an apocalyptic number.

21354554331 is a deficient number, since it is larger than the sum of its proper divisors (12628226709).

21354554331 is a wasteful number, since it uses less digits than its factorization.

21354554331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135787 (or 2135784 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The spelling of 21354554331 in words is "twenty-one billion, three hundred fifty-four million, five hundred fifty-four thousand, three hundred thirty-one".