21122615567 has 2 divisors, whose sum is σ = 21122615568. Its totient is φ = 21122615566.

The previous prime is 21122615539. The next prime is 21122615623. The reversal of 21122615567 is 76551622112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122615567 - 2¹⁸ = 21122353423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21122615567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122611567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561307783 + 10561307784.

It is an arithmetic number, because the mean of its divisors is an integer number (10561307784).

Almost surely, 2^21122615567 is an apocalyptic number.

21122615567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122615567 is an equidigital number, since it uses as much as digits as its factorization.

21122615567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 38.

The spelling of 21122615567 in words is "twenty-one billion, one hundred twenty-two million, six hundred fifteen thousand, five hundred sixty-seven".