21211033279 has 2 divisors, whose sum is σ = 21211033280. Its totient is φ = 21211033278.

The previous prime is 21211033271. The next prime is 21211033303. The reversal of 21211033279 is 97233011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211033279 - 2³ = 21211033271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211033279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211033271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605516639 + 10605516640.

It is an arithmetic number, because the mean of its divisors is an integer number (10605516640).

Almost surely, 2^21211033279 is an apocalyptic number.

21211033279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211033279 is an equidigital number, since it uses as much as digits as its factorization.

21211033279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 21211033279 in words is "twenty-one billion, two hundred eleven million, thirty-three thousand, two hundred seventy-nine".