21423099983 has 2 divisors, whose sum is σ = 21423099984. Its totient is φ = 21423099982.

The previous prime is 21423099931. The next prime is 21423099989. The reversal of 21423099983 is 38999032412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423099983 - 2²² = 21418905679 is a prime.

It is a super-2 number, since 2×21423099983² (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 (21423099989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711549991 + 10711549992.

It is an arithmetic number, because the mean of its divisors is an integer number (10711549992).

Almost surely, 2^21423099983 is an apocalyptic number.

21423099983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423099983 is an equidigital number, since it uses as much as digits as its factorization.

21423099983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 21423099983 in words is "twenty-one billion, four hundred twenty-three million, ninety-nine thousand, nine hundred eighty-three".