21471607979544 has 64 divisors (see below), whose sum is σ = 54097404007680. Its totient is φ = 7101435536000.

The previous prime is 21471607979537. The next prime is 21471607979579. The reversal of 21471607979544 is 44597970617412.

It is a super-2 number, since 2×21471607979544² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19300714 + ... + 20382854.

It is an arithmetic number, because the mean of its divisors is an integer number (845271937620).

Almost surely, 2^{21471607979544} is an apocalyptic number.

21471607979544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21471607979544 is an abundant number, since it is smaller than the sum of its proper divisors (32625796028136).

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

21471607979544 is a wasteful number, since it uses less digits than its factorization.

21471607979544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088592 (or 1088588 counting only the distinct ones).

The product of its (nonzero) digits is 106686720, while the sum is 66.

The spelling of 21471607979544 in words is "twenty-one trillion, four hundred seventy-one billion, six hundred seven million, nine hundred seventy-nine thousand, five hundred forty-four".