21111020122051 has 2 divisors, whose sum is σ = 21111020122052. Its totient is φ = 21111020122050.

The previous prime is 21111020121943. The next prime is 21111020122067. The reversal of 21111020122051 is 15022102011112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111020122051 - 2³³ = 21102430187459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111020125051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555510061025 + 10555510061026.

It is an arithmetic number, because the mean of its divisors is an integer number (10555510061026).

Almost surely, 2^{21111020122051} is an apocalyptic number.

21111020122051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111020122051 is an equidigital number, since it uses as much as digits as its factorization.

21111020122051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 21111020122051 its reverse (15022102011112), we get a palindrome (36133122133163).

The spelling of 21111020122051 in words is "twenty-one trillion, one hundred eleven billion, twenty million, one hundred twenty-two thousand, fifty-one".