122747221 has 4 divisors (see below), whose sum is σ = 125358912. Its totient is φ = 120135532.

The previous prime is 122747173. The next prime is 122747231.

122747221 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122747221 - 2⁹ = 122746709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122747221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122747231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1305775 + ... + 1305868.

It is an arithmetic number, because the mean of its divisors is an integer number (31339728).

Almost surely, 2^122747221 is an apocalyptic number.

It is an amenable number.

122747221 is a deficient number, since it is larger than the sum of its proper divisors (2611691).

122747221 is an equidigital number, since it uses as much as digits as its factorization.

122747221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611690.

The product of its digits is 3136, while the sum is 28.

The square root of 122747221 is about 11079.1344878560. The cubic root of 122747221 is about 496.9780673076.

The spelling of 122747221 in words is "one hundred twenty-two million, seven hundred forty-seven thousand, two hundred twenty-one".