21213364597879 has 2 divisors, whose sum is σ = 21213364597880. Its totient is φ = 21213364597878.

The previous prime is 21213364597801. The next prime is 21213364597903. The reversal of 21213364597879 is 97879546331212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213364597879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213364097879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606682298939 + 10606682298940.

It is an arithmetic number, because the mean of its divisors is an integer number (10606682298940).

Almost surely, 2^{21213364597879} is an apocalyptic number.

21213364597879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213364597879 is an equidigital number, since it uses as much as digits as its factorization.

21213364597879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137168640, while the sum is 67.

The spelling of 21213364597879 in words is "twenty-one trillion, two hundred thirteen billion, three hundred sixty-four million, five hundred ninety-seven thousand, eight hundred seventy-nine".