20212928998081 has 2 divisors, whose sum is σ = 20212928998082. Its totient is φ = 20212928998080.

The previous prime is 20212928998079. The next prime is 20212928998147. The reversal of 20212928998081 is 18089982921202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17291167810225 + 2921761187856 = 4158265^2 + 1709316^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212928998081 - 2¹ = 20212928998079 is a prime.

It is a super-2 number, since 2×20212928998081² (a number of 27 digits) contains 22 as substring.

Together with 20212928998079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20212928948081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106464499040 + 10106464499041.

It is an arithmetic number, because the mean of its divisors is an integer number (10106464499041).

Almost surely, 2^{20212928998081} is an apocalyptic number.

It is an amenable number.

20212928998081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212928998081 is an equidigital number, since it uses as much as digits as its factorization.

20212928998081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968, while the sum is 61.

The spelling of 20212928998081 in words is "twenty trillion, two hundred twelve billion, nine hundred twenty-eight million, nine hundred ninety-eight thousand, eighty-one".