20021221112089 has 2 divisors, whose sum is σ = 20021221112090. Its totient is φ = 20021221112088.

The previous prime is 20021221112041. The next prime is 20021221112131. The reversal of 20021221112089 is 98021112212002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12386317136400 + 7634903975689 = 3519420^2 + 2763133^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021221112089 - 2²⁹ = 20020684241177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021221112089.

It is not a weakly prime, because it can be changed into another prime (20021221116089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010610556044 + 10010610556045.

It is an arithmetic number, because the mean of its divisors is an integer number (10010610556045).

Almost surely, 2^{20021221112089} is an apocalyptic number.

It is an amenable number.

20021221112089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021221112089 is an equidigital number, since it uses as much as digits as its factorization.

20021221112089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 20021221112089 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, eighty-nine".