21213403636091 has 2 divisors, whose sum is σ = 21213403636092. Its totient is φ = 21213403636090.

The previous prime is 21213403636079. The next prime is 21213403636099. The reversal of 21213403636091 is 19063630431212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213403636091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213403636099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606701818045 + 10606701818046.

It is an arithmetic number, because the mean of its divisors is an integer number (10606701818046).

Almost surely, 2^{21213403636091} is an apocalyptic number.

21213403636091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213403636091 is an equidigital number, since it uses as much as digits as its factorization.

21213403636091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 21213403636091 in words is "twenty-one trillion, two hundred thirteen billion, four hundred three million, six hundred thirty-six thousand, ninety-one".