221421251423621 has 8 divisors (see below), whose sum is σ = 221435974214400. Its totient is φ = 221406529088160.

The previous prime is 221421251423563. The next prime is 221421251423627. The reversal of 221421251423621 is 126324152124122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221421251423621 - 2¹⁰ = 221421251422597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421251423627) 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, 1823251820 + ... + 1823373258.

It is an arithmetic number, because the mean of its divisors is an integer number (27679496776800).

Almost surely, 2^{221421251423621} is an apocalyptic number.

It is an amenable number.

221421251423621 is a deficient number, since it is larger than the sum of its proper divisors (14722790779).

221421251423621 is a wasteful number, since it uses less digits than its factorization.

221421251423621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227659.

The product of its digits is 92160, while the sum is 38.

The spelling of 221421251423621 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, four hundred twenty-three thousand, six hundred twenty-one".