221146631 has 4 divisors (see below), whose sum is σ = 221176632. Its totient is φ = 221116632.

The previous prime is 221146619. The next prime is 221146649. The reversal of 221146631 is 136641122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221146631 - 2²² = 216952327 is a prime.

It is a super-2 number, since 2×221146631² = 97811664805300322, 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 221146631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221146831) 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, 4556 + ... + 21518.

It is an arithmetic number, because the mean of its divisors is an integer number (55294158).

Almost surely, 2^221146631 is an apocalyptic number.

221146631 is a deficient number, since it is larger than the sum of its proper divisors (30001).

221146631 is a wasteful number, since it uses less digits than its factorization.

221146631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30000.

The product of its digits is 1728, while the sum is 26.

The square root of 221146631 is about 14870.9996637751. Note that the first 3 decimals coincide. The cubic root of 221146631 is about 604.7280438790.

Adding to 221146631 its reverse (136641122), we get a palindrome (357787753).

The spelling of 221146631 in words is "two hundred twenty-one million, one hundred forty-six thousand, six hundred thirty-one".