1200012002021 has 4 divisors (see below), whose sum is σ = 1371442288032. Its totient is φ = 1028581716012.

The previous prime is 1200012001967. The next prime is 1200012002027. The reversal of 1200012002021 is 1202002100021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1200012002021 - 2¹⁰ = 1200012000997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200012001993 and 1200012002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200012002027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85715142995 + ... + 85715143008.

It is an arithmetic number, because the mean of its divisors is an integer number (342860572008).

Almost surely, 2^{1200012002021} is an apocalyptic number.

It is an amenable number.

1200012002021 is a deficient number, since it is larger than the sum of its proper divisors (171430286011).

1200012002021 is an equidigital number, since it uses as much as digits as its factorization.

1200012002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171430286010.

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

Adding to 1200012002021 its reverse (1202002100021), we get a palindrome (2402014102042).

The spelling of 1200012002021 in words is "one trillion, two hundred billion, twelve million, two thousand, twenty-one".