20021128051 has 2 divisors, whose sum is σ = 20021128052. Its totient is φ = 20021128050.

The previous prime is 20021128019. The next prime is 20021128097. The reversal of 20021128051 is 15082112002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021128051 - 2⁵ = 20021128019 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021128451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010564025 + 10010564026.

It is an arithmetic number, because the mean of its divisors is an integer number (10010564026).

Almost surely, 2^20021128051 is an apocalyptic number.

20021128051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021128051 is an equidigital number, since it uses as much as digits as its factorization.

20021128051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The spelling of 20021128051 in words is "twenty billion, twenty-one million, one hundred twenty-eight thousand, fifty-one".