21736403512456 has 64 divisors (see below), whose sum is σ = 40966656260400. Its totient is φ = 10812093616128.

The previous prime is 21736403512451. The next prime is 21736403512459. The reversal of 21736403512456 is 65421530463712.

It can be written as a sum of positive squares in 8 ways, for example, as 802575889956 + 20933827622500 = 895866^2 + 4575350^2 .

It is not an unprimeable number, because it can be changed into a prime (21736403512451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8119686190 + ... + 8119688866.

Almost surely, 2^{21736403512456} is an apocalyptic number.

It is an amenable number.

21736403512456 is a deficient number, since it is larger than the sum of its proper divisors (19230252747944).

21736403512456 is a wasteful number, since it uses less digits than its factorization.

21736403512456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7018 (or 7014 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 21736403512456 in words is "twenty-one trillion, seven hundred thirty-six billion, four hundred three million, five hundred twelve thousand, four hundred fifty-six".