21023301979 has 2 divisors, whose sum is σ = 21023301980. Its totient is φ = 21023301978.

The previous prime is 21023301947. The next prime is 21023302121. The reversal of 21023301979 is 97910332012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023301979 - 2⁵ = 21023301947 is a prime.

It is a super-2 number, since 2×21023301979² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21023301919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511650989 + 10511650990.

It is an arithmetic number, because the mean of its divisors is an integer number (10511650990).

Almost surely, 2^21023301979 is an apocalyptic number.

21023301979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023301979 is an equidigital number, since it uses as much as digits as its factorization.

21023301979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 37.

The spelling of 21023301979 in words is "twenty-one billion, twenty-three million, three hundred one thousand, nine hundred seventy-nine".