221157031 has 2 divisors, whose sum is σ = 221157032. Its totient is φ = 221157030.

The previous prime is 221157011. The next prime is 221157037. The reversal of 221157031 is 130751122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221157031 - 2¹³ = 221148839 is a prime.

It is a super-2 number, since 2×221157031² = 97820864721469922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221156993 and 221157011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221157037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110578515 + 110578516.

It is an arithmetic number, because the mean of its divisors is an integer number (110578516).

Almost surely, 2^221157031 is an apocalyptic number.

221157031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221157031 is an equidigital number, since it uses as much as digits as its factorization.

221157031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 221157031 is about 14871.3493335339. The cubic root of 221157031 is about 604.7375233709.

The spelling of 221157031 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, thirty-one".