21451430631 has 8 divisors (see below), whose sum is σ = 29845468800. Its totient is φ = 13679173112.

The previous prime is 21451430629. The next prime is 21451430687. The reversal of 21451430631 is 13603415412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21451430631 - 2¹ = 21451430629 is a prime.

It is a super-2 number, since 2×21451430631² (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 (21451430131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155445081 + ... + 155445218.

It is an arithmetic number, because the mean of its divisors is an integer number (3730683600).

Almost surely, 2^21451430631 is an apocalyptic number.

21451430631 is a deficient number, since it is larger than the sum of its proper divisors (8394038169).

21451430631 is a wasteful number, since it uses less digits than its factorization.

21451430631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310890325.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 21451430631 in words is "twenty-one billion, four hundred fifty-one million, four hundred thirty thousand, six hundred thirty-one".