1200122121 has 32 divisors (see below), whose sum is σ = 1811472768. Its totient is φ = 700323840.

The previous prime is 1200122093. The next prime is 1200122153. The reversal of 1200122121 is 1212210021.

It is not a de Polignac number, because 1200122121 - 2¹⁵ = 1200089353 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200122097 and 1200122106.

It is not an unprimeable number, because it can be changed into a prime (1200122171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113371 + ... + 123503.

It is an arithmetic number, because the mean of its divisors is an integer number (56608524).

Almost surely, 2^1200122121 is an apocalyptic number.

1200122121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200122121 is a deficient number, since it is larger than the sum of its proper divisors (611350647).

1200122121 is a wasteful number, since it uses less digits than its factorization.

1200122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10281.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1200122121 is about 34642.7787713399. The cubic root of 1200122121 is about 1062.6946159952.

Adding to 1200122121 its reverse (1212210021), we get a palindrome (2412332142).

It can be divided in two parts, 120012 and 2121, that multiplied together give a palindrome (254545452).

The spelling of 1200122121 in words is "one billion, two hundred million, one hundred twenty-two thousand, one hundred twenty-one".