408213872621 has 2 divisors, whose sum is σ = 408213872622. Its totient is φ = 408213872620.

The previous prime is 408213872617. The next prime is 408213872657. The reversal of 408213872621 is 126278312804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371537792521 + 36676080100 = 609539^2 + 191510^2 .

It is a cyclic number.

It is not a de Polignac number, because 408213872621 - 2² = 408213872617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408213878621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204106936310 + 204106936311.

It is an arithmetic number, because the mean of its divisors is an integer number (204106936311).

Almost surely, 2^408213872621 is an apocalyptic number.

It is an amenable number.

408213872621 is a deficient number, since it is larger than the sum of its proper divisors (1).

408213872621 is an equidigital number, since it uses as much as digits as its factorization.

408213872621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 408213872621 in words is "four hundred eight billion, two hundred thirteen million, eight hundred seventy-two thousand, six hundred twenty-one".