221415131 has 4 divisors (see below), whose sum is σ = 253045872. Its totient is φ = 189784392.

The previous prime is 221415107. The next prime is 221415143. The reversal of 221415131 is 131514122.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-221415131 is a prime.

It is a super-2 number, since 2×221415131² = 98049320471494322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221415431) 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, 15815360 + ... + 15815373.

It is an arithmetic number, because the mean of its divisors is an integer number (63261468).

Almost surely, 2^221415131 is an apocalyptic number.

221415131 is a deficient number, since it is larger than the sum of its proper divisors (31630741).

221415131 is an equidigital number, since it uses as much as digits as its factorization.

221415131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31630740.

The product of its digits is 240, while the sum is 20.

The square root of 221415131 is about 14880.0245631518. The cubic root of 221415131 is about 604.9726836926.

Adding to 221415131 its reverse (131514122), we get a palindrome (352929253).

It can be divided in two parts, 22141 and 5131, that added together give a palindrome (27272).

The spelling of 221415131 in words is "two hundred twenty-one million, four hundred fifteen thousand, one hundred thirty-one".