21486751456 has 24 divisors (see below), whose sum is σ = 43760734920. Its totient is φ = 10372914048.

The previous prime is 21486751441. The next prime is 21486751457. The reversal of 21486751456 is 65415768412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486751457) 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, 11575986 + ... + 11577841.

It is an arithmetic number, because the mean of its divisors is an integer number (1823363955).

Almost surely, 2^21486751456 is an apocalyptic number.

It is an amenable number.

21486751456 is an abundant number, since it is smaller than the sum of its proper divisors (22273983464).

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

21486751456 is a wasteful number, since it uses less digits than its factorization.

21486751456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23153866 (or 23153858 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 49.

The spelling of 21486751456 in words is "twenty-one billion, four hundred eighty-six million, seven hundred fifty-one thousand, four hundred fifty-six".