1222125521 has 2 divisors, whose sum is σ = 1222125522. Its totient is φ = 1222125520.

The previous prime is 1222125491. The next prime is 1222125547. The reversal of 1222125521 is 1255212221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 739840000 + 482285521 = 27200^2 + 21961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222125521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1222125571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611062760 + 611062761.

It is an arithmetic number, because the mean of its divisors is an integer number (611062761).

Almost surely, 2^1222125521 is an apocalyptic number.

It is an amenable number.

1222125521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222125521 is an equidigital number, since it uses as much as digits as its factorization.

1222125521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 23.

The square root of 1222125521 is about 34958.9118966824. The cubic root of 1222125521 is about 1069.1499117558.

Adding to 1222125521 its reverse (1255212221), we get a palindrome (2477337742).

The spelling of 1222125521 in words is "one billion, two hundred twenty-two million, one hundred twenty-five thousand, five hundred twenty-one".