122409621 has 12 divisors (see below), whose sum is σ = 178801740. Its totient is φ = 80688960.

The previous prime is 122409619. The next prime is 122409643. The reversal of 122409621 is 126904221.

122409621 is a `hidden beast` number, since 12 + 24 + 0 + 9 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 41139396 + 81270225 = 6414^2 + 9015^2 .

It is not a de Polignac number, because 122409621 - 2¹ = 122409619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122409121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75610 + ... + 77211.

It is an arithmetic number, because the mean of its divisors is an integer number (14900145).

Almost surely, 2^122409621 is an apocalyptic number.

It is an amenable number.

122409621 is a deficient number, since it is larger than the sum of its proper divisors (56392119).

122409621 is a wasteful number, since it uses less digits than its factorization.

122409621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152916 (or 152913 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 122409621 is about 11063.8881501939. Note that the first 3 decimals coincide. The cubic root of 122409621 is about 496.5220248046.

The spelling of 122409621 in words is "one hundred twenty-two million, four hundred nine thousand, six hundred twenty-one".