21201944569048 has 64 divisors (see below), whose sum is σ = 42611559438240. Its totient is φ = 9854807015424.

The previous prime is 21201944568991. The next prime is 21201944569049. The reversal of 21201944569048 is 84096544910212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201944569048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201944569049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2742336 + ... + 7065712.

Almost surely, 2^{21201944569048} is an apocalyptic number.

It is an amenable number.

21201944569048 is an abundant number, since it is smaller than the sum of its proper divisors (21409614869192).

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

21201944569048 is a wasteful number, since it uses less digits than its factorization.

21201944569048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323844 (or 4323840 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 21201944569048 in words is "twenty-one trillion, two hundred one billion, nine hundred forty-four million, five hundred sixty-nine thousand, forty-eight".