21575324060990 has 64 divisors (see below), whose sum is σ = 46995021158400. Its totient is φ = 6962017399296.

The previous prime is 21575324060957. The next prime is 21575324060993. The reversal of 21575324060990 is 9906042357512.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21575324060993) 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, 144223451 + ... + 144372969.

It is an arithmetic number, because the mean of its divisors is an integer number (734297205600).

Almost surely, 2^{21575324060990} is an apocalyptic number.

21575324060990 is an abundant number, since it is smaller than the sum of its proper divisors (25419697097410).

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

21575324060990 is a wasteful number, since it uses less digits than its factorization.

21575324060990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270809.

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 21575324060990 in words is "twenty-one trillion, five hundred seventy-five billion, three hundred twenty-four million, sixty thousand, nine hundred ninety".