21249909846880 has 144 divisors (see below), whose sum is σ = 59303709695664. Its totient is φ = 7132836771840.

The previous prime is 21249909846857. The next prime is 21249909846937. The reversal of 21249909846880 is 8864890994212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35423899 + ... + 36018778.

It is an arithmetic number, because the mean of its divisors is an integer number (411831317331).

Almost surely, 2^{21249909846880} is an apocalyptic number.

21249909846880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21249909846880 is an abundant number, since it is smaller than the sum of its proper divisors (38053799848784).

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

21249909846880 is a wasteful number, since it uses less digits than its factorization.

21249909846880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71442729 (or 71442708 counting only the distinct ones).

The product of its (nonzero) digits is 143327232, while the sum is 70.

The spelling of 21249909846880 in words is "twenty-one trillion, two hundred forty-nine billion, nine hundred nine million, eight hundred forty-six thousand, eight hundred eighty".