21096040212 has 36 divisors (see below), whose sum is σ = 57428110740. Its totient is φ = 6491089152.

The previous prime is 21096040211. The next prime is 21096040223. The reversal of 21096040212 is 21204069012.

It can be written as a sum of positive squares in 2 ways, for example, as 1817828496 + 19278211716 = 42636^2 + 138846^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096040211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22538037 + ... + 22538972.

Almost surely, 2^21096040212 is an apocalyptic number.

It is an amenable number.

21096040212 is an abundant number, since it is smaller than the sum of its proper divisors (36332070528).

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

21096040212 is a wasteful number, since it uses less digits than its factorization.

21096040212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45077032 (or 45077027 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21096040212 in words is "twenty-one billion, ninety-six million, forty thousand, two hundred twelve".