21407112828916 has 12 divisors (see below), whose sum is σ = 37462589619588. Its totient is φ = 10703515794752.

The previous prime is 21407112828901. The next prime is 21407112828919. The reversal of 21407112828916 is 61982821170412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16760803248016 + 4646309580900 = 4093996^2 + 2155530^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407112828919) 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, 8953351 + ... + 11089486.

It is an arithmetic number, because the mean of its divisors is an integer number (3121882468299).

Almost surely, 2^{21407112828916} is an apocalyptic number.

It is an amenable number.

21407112828916 is a deficient number, since it is larger than the sum of its proper divisors (16055476790672).

21407112828916 is a wasteful number, since it uses less digits than its factorization.

21407112828916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20309858 (or 20309856 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 21407112828916 in words is "twenty-one trillion, four hundred seven billion, one hundred twelve million, eight hundred twenty-eight thousand, nine hundred sixteen".