21349887456 has 48 divisors (see below), whose sum is σ = 56052189648. Its totient is φ = 7115520000.

The previous prime is 21349887451. The next prime is 21349887463. The reversal of 21349887456 is 65478894312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 21349887396 and 21349887405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349887451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 803016 + ... + 829176.

It is an arithmetic number, because the mean of its divisors is an integer number (1167753951).

Almost surely, 2^21349887456 is an apocalyptic number.

It is an amenable number.

21349887456 is an abundant number, since it is smaller than the sum of its proper divisors (34702302192).

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

21349887456 is a wasteful number, since it uses less digits than its factorization.

21349887456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34675 (or 34667 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The spelling of 21349887456 in words is "twenty-one billion, three hundred forty-nine million, eight hundred eighty-seven thousand, four hundred fifty-six".