221421257642602 has 16 divisors (see below), whose sum is σ = 338076443567520. Its totient is φ = 108744530168752.

The previous prime is 221421257642581. The next prime is 221421257642609. The reversal of 221421257642602 is 206246752124122.

It is not an unprimeable number, because it can be changed into a prime (221421257642609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3855066652 + ... + 3855124087.

It is an arithmetic number, because the mean of its divisors is an integer number (21129777722970).

Almost surely, 2^{221421257642602} is an apocalyptic number.

221421257642602 is a deficient number, since it is larger than the sum of its proper divisors (116655185924918).

221421257642602 is a wasteful number, since it uses less digits than its factorization.

221421257642602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7710190997.

The product of its (nonzero) digits is 1290240, while the sum is 46.

The spelling of 221421257642602 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-seven million, six hundred forty-two thousand, six hundred two".