61011221 has 2 divisors, whose sum is σ = 61011222. Its totient is φ = 61011220.

The previous prime is 61011161. The next prime is 61011227. The reversal of 61011221 is 12211016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58354321 + 2656900 = 7639^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 61011221 - 2²² = 56816917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61011196 and 61011205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61011227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30505610 + 30505611.

It is an arithmetic number, because the mean of its divisors is an integer number (30505611).

Almost surely, 2^61011221 is an apocalyptic number.

It is an amenable number.

61011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

61011221 is an equidigital number, since it uses as much as digits as its factorization.

61011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 61011221 is about 7810.9679937892. The cubic root of 61011221 is about 393.6738542265.

Adding to 61011221 its reverse (12211016), we get a palindrome (73222237).

The spelling of 61011221 in words is "sixty-one million, eleven thousand, two hundred twenty-one".