221143031 has 2 divisors, whose sum is σ = 221143032. Its totient is φ = 221143030.

The previous prime is 221143019. The next prime is 221143049. The reversal of 221143031 is 130341122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221143031 - 2⁶ = 221142967 is a prime.

It is a super-2 number, since 2×221143031² = 97808480319733922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221143231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571515 + 110571516.

It is an arithmetic number, because the mean of its divisors is an integer number (110571516).

Almost surely, 2^221143031 is an apocalyptic number.

221143031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221143031 is an equidigital number, since it uses as much as digits as its factorization.

221143031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 221143031 is about 14870.8786223276. The cubic root of 221143031 is about 604.7247624472.

Adding to 221143031 its reverse (130341122), we get a palindrome (351484153).

The spelling of 221143031 in words is "two hundred twenty-one million, one hundred forty-three thousand, thirty-one".