1200022121 has 24 divisors (see below), whose sum is σ = 1317613824. Its totient is φ = 1091581920.

The previous prime is 1200022099. The next prime is 1200022177. The reversal of 1200022121 is 1212200021.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1200022121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200022921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1756646 + ... + 1757328.

It is an arithmetic number, because the mean of its divisors is an integer number (54900576).

Almost surely, 2^1200022121 is an apocalyptic number.

It is an amenable number.

1200022121 is a deficient number, since it is larger than the sum of its proper divisors (117591703).

1200022121 is a wasteful number, since it uses less digits than its factorization.

1200022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909 (or 890 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1200022121 is about 34641.3354390387. The cubic root of 1200022121 is about 1062.6650988842.

Adding to 1200022121 its reverse (1212200021), we get a palindrome (2412222142).

The spelling of 1200022121 in words is "one billion, two hundred million, twenty-two thousand, one hundred twenty-one".