20011110021979 has 2 divisors, whose sum is σ = 20011110021980. Its totient is φ = 20011110021978.

The previous prime is 20011110021919. The next prime is 20011110022039. The reversal of 20011110021979 is 97912001111002.

It is a balanced prime because it is at equal distance from previous prime (20011110021919) and next prime (20011110022039).

It is a cyclic number.

It is not a de Polignac number, because 20011110021979 - 2³⁷ = 19873671068507 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011110021919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005555010989 + 10005555010990.

It is an arithmetic number, because the mean of its divisors is an integer number (10005555010990).

Almost surely, 2^{20011110021979} is an apocalyptic number.

20011110021979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011110021979 is an equidigital number, since it uses as much as digits as its factorization.

20011110021979 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 20011110021979 in words is "twenty trillion, eleven billion, one hundred ten million, twenty-one thousand, nine hundred seventy-nine".