21222122099951 has 2 divisors, whose sum is σ = 21222122099952. Its totient is φ = 21222122099950.

The previous prime is 21222122099917. The next prime is 21222122100007. The reversal of 21222122099951 is 15999022122212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222122099951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222122099896 and 21222122099905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222122099911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611061049975 + 10611061049976.

It is an arithmetic number, because the mean of its divisors is an integer number (10611061049976).

Almost surely, 2^{21222122099951} is an apocalyptic number.

21222122099951 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222122099951 is an equidigital number, since it uses as much as digits as its factorization.

21222122099951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 21222122099951 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, ninety-nine thousand, nine hundred fifty-one".