21232220279 has 2 divisors, whose sum is σ = 21232220280. Its totient is φ = 21232220278.

The previous prime is 21232220257. The next prime is 21232220459. The reversal of 21232220279 is 97202223212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232220279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232220479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616110139 + 10616110140.

It is an arithmetic number, because the mean of its divisors is an integer number (10616110140).

Almost surely, 2^21232220279 is an apocalyptic number.

21232220279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232220279 is an equidigital number, since it uses as much as digits as its factorization.

21232220279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 21232220279 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty thousand, two hundred seventy-nine".