21213545032456 has 32 divisors (see below), whose sum is σ = 45572099307840. Its totient is φ = 9068618737728.

The previous prime is 21213545032423. The next prime is 21213545032483. The reversal of 21213545032456 is 65423054531212.

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, 477072610 + ... + 477117073.

It is an arithmetic number, because the mean of its divisors is an integer number (1424128103370).

Almost surely, 2^{21213545032456} is an apocalyptic number.

It is an amenable number.

21213545032456 is an abundant number, since it is smaller than the sum of its proper divisors (24358554275384).

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

21213545032456 is a wasteful number, since it uses less digits than its factorization.

21213545032456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954190093 (or 954190089 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

Adding to 21213545032456 its reverse (65423054531212), we get a palindrome (86636599563668).

The spelling of 21213545032456 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-five million, thirty-two thousand, four hundred fifty-six".