1212200121 has 16 divisors (see below), whose sum is σ = 1768448448. Its totient is φ = 732480000.

The previous prime is 1212200107. The next prime is 1212200123. The reversal of 1212200121 is 1210022121.

It is not a de Polignac number, because 1212200121 - 2⁵ = 1212200089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212200097 and 1212200106.

It is not an unprimeable number, because it can be changed into a prime (1212200123) 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, 43380 + ... + 65621.

It is an arithmetic number, because the mean of its divisors is an integer number (110528028).

Almost surely, 2^1212200121 is an apocalyptic number.

1212200121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212200121 is a deficient number, since it is larger than the sum of its proper divisors (556248327).

1212200121 is a wasteful number, since it uses less digits than its factorization.

1212200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109352.

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

The square root of 1212200121 is about 34816.6644151906. The cubic root of 1212200121 is about 1066.2477007702.

Adding to 1212200121 its reverse (1210022121), we get a palindrome (2422222242).

The spelling of 1212200121 in words is "one billion, two hundred twelve million, two hundred thousand, one hundred twenty-one".