21020020099927 has 2 divisors, whose sum is σ = 21020020099928. Its totient is φ = 21020020099926.

The previous prime is 21020020099907. The next prime is 21020020100059. The reversal of 21020020099927 is 72999002002012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020020099927 - 2²³ = 21020011711319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020020099907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510010049963 + 10510010049964.

It is an arithmetic number, because the mean of its divisors is an integer number (10510010049964).

Almost surely, 2^{21020020099927} is an apocalyptic number.

21020020099927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020020099927 is an equidigital number, since it uses as much as digits as its factorization.

21020020099927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 21020020099927 in words is "twenty-one trillion, twenty billion, twenty million, ninety-nine thousand, nine hundred twenty-seven".