431222021921 has 2 divisors, whose sum is σ = 431222021922. Its totient is φ = 431222021920.

The previous prime is 431222021861. The next prime is 431222022059. The reversal of 431222021921 is 129120222134.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233374981921 + 197847040000 = 483089^2 + 444800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431222021921 is a prime.

It is not a weakly prime, because it can be changed into another prime (431222021221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215611010960 + 215611010961.

It is an arithmetic number, because the mean of its divisors is an integer number (215611010961).

Almost surely, 2^431222021921 is an apocalyptic number.

It is an amenable number.

431222021921 is a deficient number, since it is larger than the sum of its proper divisors (1).

431222021921 is an equidigital number, since it uses as much as digits as its factorization.

431222021921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 431222021921 in words is "four hundred thirty-one billion, two hundred twenty-two million, twenty-one thousand, nine hundred twenty-one".