20512130220091 has 2 divisors, whose sum is σ = 20512130220092. Its totient is φ = 20512130220090.

The previous prime is 20512130220073. The next prime is 20512130220157. The reversal of 20512130220091 is 19002203121502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20512130220091 - 2⁵ = 20512130220059 is a prime.

It is a super-2 number, since 2×20512130220091² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20512130220011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256065110045 + 10256065110046.

It is an arithmetic number, because the mean of its divisors is an integer number (10256065110046).

Almost surely, 2^{20512130220091} is an apocalyptic number.

20512130220091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512130220091 is an equidigital number, since it uses as much as digits as its factorization.

20512130220091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 20512130220091 its reverse (19002203121502), we get a palindrome (39514333341593).

The spelling of 20512130220091 in words is "twenty trillion, five hundred twelve billion, one hundred thirty million, two hundred twenty thousand, ninety-one".