221987677 has 16 divisors (see below), whose sum is σ = 230947200. Its totient is φ = 213263680.

The previous prime is 221987669. The next prime is 221987681. The reversal of 221987677 is 776789122.

It is a cyclic number.

It is not a de Polignac number, because 221987677 - 2³ = 221987669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221987677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221987617) 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, 825099 + ... + 825367.

It is an arithmetic number, because the mean of its divisors is an integer number (14434200).

Almost surely, 2^221987677 is an apocalyptic number.

It is an amenable number.

221987677 is a deficient number, since it is larger than the sum of its proper divisors (8959523).

221987677 is a wasteful number, since it uses less digits than its factorization.

221987677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

The product of its digits is 592704, while the sum is 49.

The square root of 221987677 is about 14899.2508872091. The cubic root of 221987677 is about 605.4936907849.

The spelling of 221987677 in words is "two hundred twenty-one million, nine hundred eighty-seven thousand, six hundred seventy-seven".