221561482251 has 8 divisors (see below), whose sum is σ = 295417859904. Its totient is φ = 147706379720.

The previous prime is 221561482237. The next prime is 221561482271. The reversal of 221561482251 is 152284165122.

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 221561482251 - 2⁷ = 221561482123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221561482271) 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, 213736 + ... + 699146.

It is an arithmetic number, because the mean of its divisors is an integer number (36927232488).

Almost surely, 2^221561482251 is an apocalyptic number.

221561482251 is a deficient number, since it is larger than the sum of its proper divisors (73856377653).

221561482251 is a wasteful number, since it uses less digits than its factorization.

221561482251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637561.

The product of its digits is 76800, while the sum is 39.

The spelling of 221561482251 in words is "two hundred twenty-one billion, five hundred sixty-one million, four hundred eighty-two thousand, two hundred fifty-one".