1200121212021 has 128 divisors (see below), whose sum is σ = 1784816861184. Its totient is φ = 714182676480.

The previous prime is 1200121212007. The next prime is 1200121212067. The reversal of 1200121212021 is 1202121210021.

It is not a de Polignac number, because 1200121212021 - 2⁶ = 1200121211957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121212721) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6283357036 + ... + 6283357226.

It is an arithmetic number, because the mean of its divisors is an integer number (13943881728).

Almost surely, 2^{1200121212021} is an apocalyptic number.

It is an amenable number.

1200121212021 is a deficient number, since it is larger than the sum of its proper divisors (584695649163).

1200121212021 is a wasteful number, since it uses less digits than its factorization.

1200121212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1200121212021 its reverse (1202121210021), we get a palindrome (2402242422042).

The spelling of 1200121212021 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".