221431421372621 has 8 divisors (see below), whose sum is σ = 225953044097760. Its totient is φ = 216935416907152.

The previous prime is 221431421372563. The next prime is 221431421372687. The reversal of 221431421372621 is 126273124134122.

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 221431421372621 - 2¹⁴ = 221431421356237 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 (221431421372321) 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, 6404547455 + ... + 6404582028.

It is an arithmetic number, because the mean of its divisors is an integer number (28244130512220).

Almost surely, 2^{221431421372621} is an apocalyptic number.

It is an amenable number.

221431421372621 is a deficient number, since it is larger than the sum of its proper divisors (4521622725139).

221431421372621 is a wasteful number, since it uses less digits than its factorization.

221431421372621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12809129835.

The product of its digits is 193536, while the sum is 41.

The spelling of 221431421372621 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, four hundred twenty-one million, three hundred seventy-two thousand, six hundred twenty-one".