21521350454232 has 32 divisors (see below), whose sum is σ = 54007951726080. Its totient is φ = 7146506739360.

The previous prime is 21521350454207. The next prime is 21521350454251. The reversal of 21521350454232 is 23245405312512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1704790144 + ... + 1704802767.

It is an arithmetic number, because the mean of its divisors is an integer number (1687748491440).

Almost surely, 2^{21521350454232} is an apocalyptic number.

It is an amenable number.

21521350454232 is an abundant number, since it is smaller than the sum of its proper divisors (32486601271848).

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

21521350454232 is a wasteful number, since it uses less digits than its factorization.

21521350454232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409593183 (or 3409593179 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21521350454232 its reverse (23245405312512), we get a palindrome (44766755766744).

The spelling of 21521350454232 in words is "twenty-one trillion, five hundred twenty-one billion, three hundred fifty million, four hundred fifty-four thousand, two hundred thirty-two".