406367108921 has 2 divisors, whose sum is σ = 406367108922. Its totient is φ = 406367108920.

The previous prime is 406367108909. The next prime is 406367108929. The reversal of 406367108921 is 129801763604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354286848400 + 52080260521 = 595220^2 + 228211^2 .

It is a cyclic number.

It is not a de Polignac number, because 406367108921 - 2⁶ = 406367108857 is a prime.

It is not a weakly prime, because it can be changed into another prime (406367108929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203183554460 + 203183554461.

It is an arithmetic number, because the mean of its divisors is an integer number (203183554461).

Almost surely, 2^406367108921 is an apocalyptic number.

It is an amenable number.

406367108921 is a deficient number, since it is larger than the sum of its proper divisors (1).

406367108921 is an equidigital number, since it uses as much as digits as its factorization.

406367108921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 406367108921 in words is "four hundred six billion, three hundred sixty-seven million, one hundred eight thousand, nine hundred twenty-one".