21451332462 has 64 divisors (see below), whose sum is σ = 54648276480. Its totient is φ = 5464820736.

The previous prime is 21451332449. The next prime is 21451332493. The reversal of 21451332462 is 26423315412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 777063 + ... + 804194.

It is an arithmetic number, because the mean of its divisors is an integer number (853879320).

Almost surely, 2^21451332462 is an apocalyptic number.

21451332462 is an abundant number, since it is smaller than the sum of its proper divisors (33196944018).

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

21451332462 is a wasteful number, since it uses less digits than its factorization.

21451332462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581305.

The product of its digits is 34560, while the sum is 33.

Adding to 21451332462 its reverse (26423315412), we get a palindrome (47874647874).

The spelling of 21451332462 in words is "twenty-one billion, four hundred fifty-one million, three hundred thirty-two thousand, four hundred sixty-two".