122207157721 has 16 divisors (see below), whose sum is σ = 134061723648. Its totient is φ = 110477885200.

The previous prime is 122207157707. The next prime is 122207157731. The reversal of 122207157721 is 127751702221.

It is a cyclic number.

It is not a de Polignac number, because 122207157721 - 2²⁵ = 122173603289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122207157701) 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, 2126556 + ... + 2183266.

It is an arithmetic number, because the mean of its divisors is an integer number (8378857728).

Almost surely, 2^122207157721 is an apocalyptic number.

122207157721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122207157721 is a deficient number, since it is larger than the sum of its proper divisors (11854565927).

122207157721 is a wasteful number, since it uses less digits than its factorization.

122207157721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57812.

The product of its (nonzero) digits is 27440, while the sum is 37.

Adding to 122207157721 its reverse (127751702221), we get a palindrome (249958859942).

The spelling of 122207157721 in words is "one hundred twenty-two billion, two hundred seven million, one hundred fifty-seven thousand, seven hundred twenty-one".