221141731 has 2 divisors, whose sum is σ = 221141732. Its totient is φ = 221141730.

The previous prime is 221141719. The next prime is 221141761. The reversal of 221141731 is 137141122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221141731 - 2⁷ = 221141603 is a prime.

It is a super-2 number, since 2×221141731² = 97807330379352722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221141761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110570865 + 110570866.

It is an arithmetic number, because the mean of its divisors is an integer number (110570866).

Almost surely, 2^221141731 is an apocalyptic number.

221141731 is a deficient number, since it is larger than the sum of its proper divisors (1).

221141731 is an equidigital number, since it uses as much as digits as its factorization.

221141731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 22.

The square root of 221141731 is about 14870.8349126739. The cubic root of 221141731 is about 604.7235774770.

Adding to 221141731 its reverse (137141122), we get a palindrome (358282853).

The spelling of 221141731 in words is "two hundred twenty-one million, one hundred forty-one thousand, seven hundred thirty-one".