21465306543212 has 96 divisors (see below), whose sum is σ = 43631139815424. Its totient is φ = 9049893652800.

The previous prime is 21465306543179. The next prime is 21465306543223. The reversal of 21465306543212 is 21234560356412.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2512615013 + ... + 2512623555.

It is an arithmetic number, because the mean of its divisors is an integer number (454491039744).

Almost surely, 2^{21465306543212} is an apocalyptic number.

It is an amenable number.

21465306543212 is an abundant number, since it is smaller than the sum of its proper divisors (22165833272212).

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

21465306543212 is a wasteful number, since it uses less digits than its factorization.

21465306543212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11259 (or 11257 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

Adding to 21465306543212 its reverse (21234560356412), we get a palindrome (42699866899624).

The spelling of 21465306543212 in words is "twenty-one trillion, four hundred sixty-five billion, three hundred six million, five hundred forty-three thousand, two hundred twelve".