1011261221 has 2 divisors, whose sum is σ = 1011261222. Its totient is φ = 1011261220.

The previous prime is 1011261211. The next prime is 1011261227. The reversal of 1011261221 is 1221621101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867597025 + 143664196 = 29455^2 + 11986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011261221 - 2²² = 1007066917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011261221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011261227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505630610 + 505630611.

It is an arithmetic number, because the mean of its divisors is an integer number (505630611).

Almost surely, 2^1011261221 is an apocalyptic number.

It is an amenable number.

1011261221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011261221 is an equidigital number, since it uses as much as digits as its factorization.

1011261221 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 17.

The square root of 1011261221 is about 31800.3336617715. Note that the first 3 decimals coincide. The cubic root of 1011261221 is about 1003.7397372643.

Adding to 1011261221 its reverse (1221621101), we get a palindrome (2232882322).

The spelling of 1011261221 in words is "one billion, eleven million, two hundred sixty-one thousand, two hundred twenty-one".