21112122122051 has 2 divisors, whose sum is σ = 21112122122052. Its totient is φ = 21112122122050.

The previous prime is 21112122122023. The next prime is 21112122122131. The reversal of 21112122122051 is 15022122121112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112122122051 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21112122122851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556061061025 + 10556061061026.

It is an arithmetic number, because the mean of its divisors is an integer number (10556061061026).

Almost surely, 2^{21112122122051} is an apocalyptic number.

21112122122051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112122122051 is an equidigital number, since it uses as much as digits as its factorization.

21112122122051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 21112122122051 its reverse (15022122121112), we get a palindrome (36134244243163).

The spelling of 21112122122051 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, one hundred twenty-two thousand, fifty-one".