21498049968072 has 16 divisors (see below), whose sum is σ = 53745124920240. Its totient is φ = 7166016656016.

The previous prime is 21498049968023. The next prime is 21498049968091. The reversal of 21498049968072 is 27086994089412.

It is a junction number, because it is equal to n+sod(n) for n = 21498049967988 and 21498049968006.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447876040978 + ... + 447876041025.

It is an arithmetic number, because the mean of its divisors is an integer number (3359070307515).

Almost surely, 2^{21498049968072} is an apocalyptic number.

It is an amenable number.

21498049968072 is an abundant number, since it is smaller than the sum of its proper divisors (32247074952168).

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

21498049968072 is a wasteful number, since it uses less digits than its factorization.

21498049968072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895752082012 (or 895752082008 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 69.

The spelling of 21498049968072 in words is "twenty-one trillion, four hundred ninety-eight billion, forty-nine million, nine hundred sixty-eight thousand, seventy-two".