21021213012967 has 2 divisors, whose sum is σ = 21021213012968. Its totient is φ = 21021213012966.

The previous prime is 21021213012937. The next prime is 21021213013043. The reversal of 21021213012967 is 76921031212012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021213012967 - 2²⁷ = 21021078795239 is a prime.

It is a super-2 number, since 2×21021213012967² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021213012937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510606506483 + 10510606506484.

It is an arithmetic number, because the mean of its divisors is an integer number (10510606506484).

Almost surely, 2^{21021213012967} is an apocalyptic number.

21021213012967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021213012967 is an equidigital number, since it uses as much as digits as its factorization.

21021213012967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

Adding to 21021213012967 its reverse (76921031212012), we get a palindrome (97942244224979).

The spelling of 21021213012967 in words is "twenty-one trillion, twenty-one billion, two hundred thirteen million, twelve thousand, nine hundred sixty-seven".