221617461 has 16 divisors (see below), whose sum is σ = 319879616. Its totient is φ = 135668736.

The previous prime is 221617447. The next prime is 221617471. The reversal of 221617461 is 164716122.

It is not a de Polignac number, because 221617461 - 2⁹ = 221616949 is a prime.

It is a super-2 number, since 2×221617461² = 98228598040173042, which 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 (221617411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7195 + ... + 22248.

It is an arithmetic number, because the mean of its divisors is an integer number (19992476).

Almost surely, 2^221617461 is an apocalyptic number.

It is an amenable number.

221617461 is a deficient number, since it is larger than the sum of its proper divisors (98262155).

221617461 is a wasteful number, since it uses less digits than its factorization.

221617461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29652.

The product of its digits is 4032, while the sum is 30.

The square root of 221617461 is about 14886.8217225840. The cubic root of 221617461 is about 605.1569030471.

The spelling of 221617461 in words is "two hundred twenty-one million, six hundred seventeen thousand, four hundred sixty-one".