1200212121021 has 32 divisors (see below), whose sum is σ = 1649603420160. Its totient is φ = 775645222464.

The previous prime is 1200212121011. The next prime is 1200212121089. The reversal of 1200212121021 is 1201212120021.

It is not a de Polignac number, because 1200212121021 - 2⁶ = 1200212120957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200212121011) 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, 41339316 + ... + 41368338.

It is an arithmetic number, because the mean of its divisors is an integer number (51550106880).

Almost surely, 2^{1200212121021} is an apocalyptic number.

It is an amenable number.

1200212121021 is a deficient number, since it is larger than the sum of its proper divisors (449391299139).

1200212121021 is a wasteful number, since it uses less digits than its factorization.

1200212121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30425.

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

Adding to 1200212121021 its reverse (1201212120021), we get a palindrome (2401424241042).

The spelling of 1200212121021 in words is "one trillion, two hundred billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".