101221110021979 has 2 divisors, whose sum is σ = 101221110021980. Its totient is φ = 101221110021978.

The previous prime is 101221110021971. The next prime is 101221110022013. The reversal of 101221110021979 is 979120011122101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101221110021979 - 2³ = 101221110021971 is a prime.

It is a super-2 number, since 2×101221110021979² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (101221110021971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610555010989 + 50610555010990.

It is an arithmetic number, because the mean of its divisors is an integer number (50610555010990).

Almost surely, 2^{101221110021979} is an apocalyptic number.

101221110021979 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221110021979 is an equidigital number, since it uses as much as digits as its factorization.

101221110021979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 37.

The spelling of 101221110021979 in words is "one hundred one trillion, two hundred twenty-one billion, one hundred ten million, twenty-one thousand, nine hundred seventy-nine".