221253631 has 8 divisors (see below), whose sum is σ = 224843904. Its totient is φ = 217671960.

The previous prime is 221253611. The next prime is 221253653. The reversal of 221253631 is 136352122.

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

It is a cyclic number.

It is not a de Polignac number, because 221253631 - 2²¹ = 219156479 is a prime.

It is a super-2 number, since 2×221253631² = 97906338461368322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221253596 and 221253605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221253601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67476 + ... + 70678.

It is an arithmetic number, because the mean of its divisors is an integer number (28105488).

Almost surely, 2^221253631 is an apocalyptic number.

221253631 is a deficient number, since it is larger than the sum of its proper divisors (3590273).

221253631 is a wasteful number, since it uses less digits than its factorization.

221253631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301.

The product of its digits is 2160, while the sum is 25.

The square root of 221253631 is about 14874.5968348725. The cubic root of 221253631 is about 604.8255590697.

The spelling of 221253631 in words is "two hundred twenty-one million, two hundred fifty-three thousand, six hundred thirty-one".