21515453420532 has 24 divisors (see below), whose sum is σ = 50209117676256. Its totient is φ = 7170904517088.

The previous prime is 21515453420471. The next prime is 21515453420533. The reversal of 21515453420532 is 23502435451512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515453420533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114063058 + ... + 114251529.

It is an arithmetic number, because the mean of its divisors is an integer number (2092046569844).

Almost surely, 2^{21515453420532} is an apocalyptic number.

It is an amenable number.

21515453420532 is an abundant number, since it is smaller than the sum of its proper divisors (28693664255724).

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

21515453420532 is a wasteful number, since it uses less digits than its factorization.

21515453420532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228322447 (or 228322445 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 21515453420532 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty-three million, four hundred twenty thousand, five hundred thirty-two".