122951721 has 16 divisors (see below), whose sum is σ = 171639936. Its totient is φ = 78139776.

The previous prime is 122951707. The next prime is 122951771. The reversal of 122951721 is 127159221.

It is not a de Polignac number, because 122951721 - 2⁷ = 122951593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122951771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18751 + ... + 24443.

It is an arithmetic number, because the mean of its divisors is an integer number (10727496).

Almost surely, 2^122951721 is an apocalyptic number.

It is an amenable number.

122951721 is a deficient number, since it is larger than the sum of its proper divisors (48688215).

122951721 is a wasteful number, since it uses less digits than its factorization.

122951721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6032.

The product of its digits is 2520, while the sum is 30.

The square root of 122951721 is about 11088.3597073688. The cubic root of 122951721 is about 497.2539068897.

The spelling of 122951721 in words is "one hundred twenty-two million, nine hundred fifty-one thousand, seven hundred twenty-one".