21354545372576 has 24 divisors (see below), whose sum is σ = 45275742834084. Its totient is φ = 9855944017920.

The previous prime is 21354545372569. The next prime is 21354545372609. The reversal of 21354545372576 is 67527354545312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21351090284176 + 3455088400 = 4620724^2 + 58780^2 .

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, 25666520465 + ... + 25666521296.

Almost surely, 2^{21354545372576} is an apocalyptic number.

21354545372576 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21354545372576 is an abundant number, since it is smaller than the sum of its proper divisors (23921197461508).

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

21354545372576 is a wasteful number, since it uses less digits than its factorization.

21354545372576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51333041784 (or 51333041776 counting only the distinct ones).

The product of its digits is 105840000, while the sum is 59.

The spelling of 21354545372576 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred forty-five million, three hundred seventy-two thousand, five hundred seventy-six".