21479265390912 has 224 divisors, whose sum is σ = 66066360729600. Its totient is φ = 6032072097792.

The previous prime is 21479265390911. The next prime is 21479265390929. The reversal of 21479265390912 is 21909356297412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×21479265390912² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21479265390911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23223664 + ... + 24130832.

It is an arithmetic number, because the mean of its divisors is an integer number (294939110400).

Almost surely, 2^{21479265390912} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21479265390912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33033180364800).

21479265390912 is an abundant number, since it is smaller than the sum of its proper divisors (44587095338688).

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

21479265390912 is a wasteful number, since it uses less digits than its factorization.

21479265390912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907493 (or 907483 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 60.

The spelling of 21479265390912 in words is "twenty-one trillion, four hundred seventy-nine billion, two hundred sixty-five million, three hundred ninety thousand, nine hundred twelve".