221525161320461 has 4 divisors (see below), whose sum is σ = 221969099520000. Its totient is φ = 221081223120924.

The previous prime is 221525161320431. The next prime is 221525161320599. The reversal of 221525161320461 is 164023161525122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221525161320461 - 2³⁴ = 221507981451277 is a prime.

It is a super-2 number, since 2×221525161320461² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221525161320431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221969099021 + ... + 221969100018.

It is an arithmetic number, because the mean of its divisors is an integer number (55492274880000).

Almost surely, 2^{221525161320461} is an apocalyptic number.

It is an amenable number.

221525161320461 is a deficient number, since it is larger than the sum of its proper divisors (443938199539).

221525161320461 is an equidigital number, since it uses as much as digits as its factorization.

221525161320461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443938199538.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 221525161320461 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, one hundred sixty-one million, three hundred twenty thousand, four hundred sixty-one".