21273966983 has 2 divisors, whose sum is σ = 21273966984. Its totient is φ = 21273966982.

The previous prime is 21273966979. The next prime is 21273967021. The reversal of 21273966983 is 38966937212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21273966983 - 2² = 21273966979 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21273966383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636983491 + 10636983492.

It is an arithmetic number, because the mean of its divisors is an integer number (10636983492).

Almost surely, 2^21273966983 is an apocalyptic number.

21273966983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21273966983 is an equidigital number, since it uses as much as digits as its factorization.

21273966983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The spelling of 21273966983 in words is "twenty-one billion, two hundred seventy-three million, nine hundred sixty-six thousand, nine hundred eighty-three".