21662013650507 has 2 divisors, whose sum is σ = 21662013650508. Its totient is φ = 21662013650506.

The previous prime is 21662013650503. The next prime is 21662013650509. The reversal of 21662013650507 is 70505631026612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21662013650507 - 2² = 21662013650503 is a prime.

Together with 21662013650509, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21662013650503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10831006825253 + 10831006825254.

It is an arithmetic number, because the mean of its divisors is an integer number (10831006825254).

Almost surely, 2^{21662013650507} is an apocalyptic number.

21662013650507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21662013650507 is an equidigital number, since it uses as much as digits as its factorization.

21662013650507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 21662013650507 in words is "twenty-one trillion, six hundred sixty-two billion, thirteen million, six hundred fifty thousand, five hundred seven".