21020011122091 has 2 divisors, whose sum is σ = 21020011122092. Its totient is φ = 21020011122090.

The previous prime is 21020011122079. The next prime is 21020011122107. The reversal of 21020011122091 is 19022111002012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020011122091 - 2¹⁵ = 21020011089323 is a prime.

It is a super-3 number, since 3×21020011122091³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21020011122001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510005561045 + 10510005561046.

It is an arithmetic number, because the mean of its divisors is an integer number (10510005561046).

Almost surely, 2^{21020011122091} is an apocalyptic number.

21020011122091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020011122091 is an equidigital number, since it uses as much as digits as its factorization.

21020011122091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21020011122091 in words is "twenty-one trillion, twenty billion, eleven million, one hundred twenty-two thousand, ninety-one".