221422977 has 30 divisors (see below), whose sum is σ = 351100134. Its totient is φ = 138585600.

The previous prime is 221422963. The next prime is 221423009. The reversal of 221422977 is 779224122.

221422977 is a `hidden beast` number, since 221 + 422 + 9 + 7 + 7 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 196112016 + 25310961 = 14004^2 + 5031^2 .

It is not a de Polignac number, because 221422977 - 2⁴ = 221422961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221422937) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 551977 + ... + 552377.

Almost surely, 2^221422977 is an apocalyptic number.

221422977 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

221422977 is a deficient number, since it is larger than the sum of its proper divisors (129677157).

221422977 is an frugal number, since it uses more digits than its factorization.

221422977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 421 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 221422977 is about 14880.2882028541. The cubic root of 221422977 is about 604.9798294848.

The spelling of 221422977 in words is "two hundred twenty-one million, four hundred twenty-two thousand, nine hundred seventy-seven".