122213561 has 16 divisors (see below), whose sum is σ = 133562880. Its totient is φ = 111386880.

The previous prime is 122213557. The next prime is 122213587. The reversal of 122213561 is 165312221.

It is a cyclic number.

It is not a de Polignac number, because 122213561 - 2² = 122213557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122213551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68600 + ... + 70358.

It is an arithmetic number, because the mean of its divisors is an integer number (8347680).

Almost surely, 2^122213561 is an apocalyptic number.

It is an amenable number.

122213561 is a deficient number, since it is larger than the sum of its proper divisors (11349319).

122213561 is a wasteful number, since it uses less digits than its factorization.

122213561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904.

The product of its digits is 720, while the sum is 23.

The square root of 122213561 is about 11055.0242423977. The cubic root of 122213561 is about 496.2567947601.

Adding to 122213561 its reverse (165312221), we get a palindrome (287525782).

The spelling of 122213561 in words is "one hundred twenty-two million, two hundred thirteen thousand, five hundred sixty-one".