10221232261 has 2 divisors, whose sum is σ = 10221232262. Its totient is φ = 10221232260.

The previous prime is 10221232253. The next prime is 10221232319. The reversal of 10221232261 is 16223212201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9879167236 + 342065025 = 99394^2 + 18495^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221232261 - 2³ = 10221232253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10221232061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110616130 + 5110616131.

It is an arithmetic number, because the mean of its divisors is an integer number (5110616131).

Almost surely, 2^10221232261 is an apocalyptic number.

It is an amenable number.

10221232261 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221232261 is an equidigital number, since it uses as much as digits as its factorization.

10221232261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 10221232261 its reverse (16223212201), we get a palindrome (26444444462).

The spelling of 10221232261 in words is "ten billion, two hundred twenty-one million, two hundred thirty-two thousand, two hundred sixty-one".