21007046279 has 2 divisors, whose sum is σ = 21007046280. Its totient is φ = 21007046278.

The previous prime is 21007046213. The next prime is 21007046287. The reversal of 21007046279 is 97264070012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21007046279 - 2⁸ = 21007046023 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21007042279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10503523139 + 10503523140.

It is an arithmetic number, because the mean of its divisors is an integer number (10503523140).

Almost surely, 2^21007046279 is an apocalyptic number.

21007046279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21007046279 is an equidigital number, since it uses as much as digits as its factorization.

21007046279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 21007046279 in words is "twenty-one billion, seven million, forty-six thousand, two hundred seventy-nine".