21364720412104 has 16 divisors (see below), whose sum is σ = 40058946190620. Its totient is φ = 10682334761280.

The previous prime is 21364720412093. The next prime is 21364720412107. The reversal of 21364720412104 is 40121402746312.

It can be written as a sum of positive squares in 2 ways, for example, as 18008972715204 + 3355747696900 = 4243698^2 + 1831870^2 .

It is not an unprimeable number, because it can be changed into a prime (21364720412107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660834 + ... + 6570094.

Almost surely, 2^{21364720412104} is an apocalyptic number.

It is an amenable number.

21364720412104 is a deficient number, since it is larger than the sum of its proper divisors (18694225778516).

21364720412104 is a wasteful number, since it uses less digits than its factorization.

21364720412104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6361200 (or 6361196 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 21364720412104 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred twenty million, four hundred twelve thousand, one hundred four".