21689280369372 has 48 divisors (see below), whose sum is σ = 63096088349952. Its totient is φ = 5633579316480.

The previous prime is 21689280369331. The next prime is 21689280369373. The reversal of 21689280369372 is 27396308298612.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21689280369373) 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, 11736622653 + ... + 11736624500.

It is an arithmetic number, because the mean of its divisors is an integer number (1314501840624).

Almost surely, 2^{21689280369372} is an apocalyptic number.

21689280369372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21689280369372 is an abundant number, since it is smaller than the sum of its proper divisors (41406807980580).

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

21689280369372 is a wasteful number, since it uses less digits than its factorization.

21689280369372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23473247178 (or 23473247176 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 66.

The spelling of 21689280369372 in words is "twenty-one trillion, six hundred eighty-nine billion, two hundred eighty million, three hundred sixty-nine thousand, three hundred seventy-two".