21970650679 has 2 divisors, whose sum is σ = 21970650680. Its totient is φ = 21970650678.

The previous prime is 21970650671. The next prime is 21970650683. The reversal of 21970650679 is 97605607912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21970650679 - 2³ = 21970650671 is a prime.

It is a super-2 number, since 2×21970650679² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21970650671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10985325339 + 10985325340.

It is an arithmetic number, because the mean of its divisors is an integer number (10985325340).

Almost surely, 2^21970650679 is an apocalyptic number.

21970650679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21970650679 is an equidigital number, since it uses as much as digits as its factorization.

21970650679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The spelling of 21970650679 in words is "twenty-one billion, nine hundred seventy million, six hundred fifty thousand, six hundred seventy-nine".