221427970 has 8 divisors (see below), whose sum is σ = 398570364. Its totient is φ = 88571184.

The previous prime is 221427967. The next prime is 221427971. The reversal of 221427970 is 79724122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 221206129 + 221841 = 14873^2 + 471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221427971) 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, 11071389 + ... + 11071408.

Almost surely, 2^221427970 is an apocalyptic number.

221427970 is a deficient number, since it is larger than the sum of its proper divisors (177142394).

221427970 is a wasteful number, since it uses less digits than its factorization.

221427970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22142804.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 221427970 is about 14880.4559741965. The cubic root of 221427970 is about 604.9843768021.

The spelling of 221427970 in words is "two hundred twenty-one million, four hundred twenty-seven thousand, nine hundred seventy".