421132222105921 has 2 divisors, whose sum is σ = 421132222105922. Its totient is φ = 421132222105920.

The previous prime is 421132222105919. The next prime is 421132222105937. The reversal of 421132222105921 is 129501222231124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265130748202896 + 156001473903025 = 16282836^2 + 12490055^2 .

It is a cyclic number.

It is not a de Polignac number, because 421132222105921 - 2¹ = 421132222105919 is a prime.

Together with 421132222105919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (421132222105121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210566111052960 + 210566111052961.

It is an arithmetic number, because the mean of its divisors is an integer number (210566111052961).

Almost surely, 2^{421132222105921} is an apocalyptic number.

It is an amenable number.

421132222105921 is a deficient number, since it is larger than the sum of its proper divisors (1).

421132222105921 is an equidigital number, since it uses as much as digits as its factorization.

421132222105921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 421132222105921 in words is "four hundred twenty-one trillion, one hundred thirty-two billion, two hundred twenty-two million, one hundred five thousand, nine hundred twenty-one".