21020101011979 has 2 divisors, whose sum is σ = 21020101011980. Its totient is φ = 21020101011978.

The previous prime is 21020101011961. The next prime is 21020101012039. The reversal of 21020101011979 is 97911010102012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020101011979 - 2⁷ = 21020101011851 is a prime.

It is a super-3 number, since 3×21020101011979³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21020101011779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510050505989 + 10510050505990.

It is an arithmetic number, because the mean of its divisors is an integer number (10510050505990).

Almost surely, 2^{21020101011979} is an apocalyptic number.

21020101011979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020101011979 is an equidigital number, since it uses as much as digits as its factorization.

21020101011979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 34.

The spelling of 21020101011979 in words is "twenty-one trillion, twenty billion, one hundred one million, eleven thousand, nine hundred seventy-nine".