20021021011969 has 2 divisors, whose sum is σ = 20021021011970. Its totient is φ = 20021021011968.

The previous prime is 20021021011877. The next prime is 20021021012023. The reversal of 20021021011969 is 96911012012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16570696186944 + 3450324825025 = 4070712^2 + 1857505^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021021011969 - 2⁷ = 20021021011841 is a prime.

It is a super-2 number, since 2×20021021011969² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20021021011669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510505984 + 10010510505985.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510505985).

Almost surely, 2^{20021021011969} is an apocalyptic number.

It is an amenable number.

20021021011969 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021021011969 is an equidigital number, since it uses as much as digits as its factorization.

20021021011969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 20021021011969 in words is "twenty trillion, twenty-one billion, twenty-one million, eleven thousand, nine hundred sixty-nine".