221421255243251 has 8 divisors (see below), whose sum is σ = 254377747236864. Its totient is φ = 188795984275080.

The previous prime is 221421255243239. The next prime is 221421255243289. The reversal of 221421255243251 is 152342552124122.

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

It is a de Polignac number, because none of the positive numbers 2^k-221421255243251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221421255243199 and 221421255243208.

It is not an unprimeable number, because it can be changed into a prime (221421255243211) 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, 82805254925 + ... + 82805257598.

It is an arithmetic number, because the mean of its divisors is an integer number (31797218404608).

Almost surely, 2^{221421255243251} is an apocalyptic number.

221421255243251 is a deficient number, since it is larger than the sum of its proper divisors (32956491993613).

221421255243251 is a wasteful number, since it uses less digits than its factorization.

221421255243251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165610512721.

The product of its digits is 384000, while the sum is 41.

The spelling of 221421255243251 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, two hundred forty-three thousand, two hundred fifty-one".