221202131 has 2 divisors, whose sum is σ = 221202132. Its totient is φ = 221202130.

The previous prime is 221202119. The next prime is 221202173. The reversal of 221202131 is 131202122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221202131 - 2¹⁴ = 221185747 is a prime.

It is a super-2 number, since 2×221202131² = 97860765517882322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221202031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110601065 + 110601066.

It is an arithmetic number, because the mean of its divisors is an integer number (110601066).

Almost surely, 2^221202131 is an apocalyptic number.

221202131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221202131 is an equidigital number, since it uses as much as digits as its factorization.

221202131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221202131 is about 14872.8655947669. The cubic root of 221202131 is about 604.7786281136.

Adding to 221202131 its reverse (131202122), we get a palindrome (352404253).

Subtracting from 221202131 its reverse (131202122), we obtain a palindrome (90000009).

The spelling of 221202131 in words is "two hundred twenty-one million, two hundred two thousand, one hundred thirty-one".