720122111022121 has 4 divisors (see below), whose sum is σ = 720125043826644. Its totient is φ = 720119178217600.

The previous prime is 720122111022023. The next prime is 720122111022137. The reversal of 720122111022121 is 121220111221027.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 207513388355625 + 512608722666496 = 14405325^2 + 22640864^2 .

It is a cyclic number.

It is not a de Polignac number, because 720122111022121 - 2⁴¹ = 717923087766569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720122111022151) 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, 1466033920 + ... + 1466525041.

It is an arithmetic number, because the mean of its divisors is an integer number (180031260956661).

Almost surely, 2^{720122111022121} is an apocalyptic number.

It is an amenable number.

720122111022121 is a deficient number, since it is larger than the sum of its proper divisors (2932804523).

720122111022121 is a wasteful number, since it uses less digits than its factorization.

720122111022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932804522.

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 720122111022121 its reverse (121220111221027), we get a palindrome (841342222243148).

The spelling of 720122111022121 in words is "seven hundred twenty trillion, one hundred twenty-two billion, one hundred eleven million, twenty-two thousand, one hundred twenty-one".