21214036536397 has 16 divisors (see below), whose sum is σ = 22895015824512. Its totient is φ = 19583736860160.

The previous prime is 21214036536349. The next prime is 21214036536401. The reversal of 21214036536397 is 79363563041212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21214036536397 - 2³⁵ = 21179676798029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536097) 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, 39702729 + ... + 40233502.

It is an arithmetic number, because the mean of its divisors is an integer number (1430938489032).

Almost surely, 2^{21214036536397} is an apocalyptic number.

It is an amenable number.

21214036536397 is a deficient number, since it is larger than the sum of its proper divisors (1680979288115).

21214036536397 is a wasteful number, since it uses less digits than its factorization.

21214036536397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79936548.

The product of its (nonzero) digits is 4898880, while the sum is 52.

The spelling of 21214036536397 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, three hundred ninety-seven".