221263631 has 8 divisors (see below), whose sum is σ = 224135184. Its totient is φ = 218410560.

The previous prime is 221263621. The next prime is 221263643. The reversal of 221263631 is 136362122.

221263631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221263631 is a prime.

It is a super-2 number, since 2×221263631² = 97915188806608322, which contains 22 as substring.

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 221263631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221263621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20336 + ... + 29258.

It is an arithmetic number, because the mean of its divisors is an integer number (28016898).

Almost surely, 2^221263631 is an apocalyptic number.

221263631 is a deficient number, since it is larger than the sum of its proper divisors (2871553).

221263631 is a wasteful number, since it uses less digits than its factorization.

221263631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9241.

The product of its digits is 2592, while the sum is 26.

The square root of 221263631 is about 14874.9329746389. The cubic root of 221263631 is about 604.8346710324.

The spelling of 221263631 in words is "two hundred twenty-one million, two hundred sixty-three thousand, six hundred thirty-one".