1200212200021 has 16 divisors (see below), whose sum is σ = 1273475174400. Its totient is φ = 1127964754800.

The previous prime is 1200212199997. The next prime is 1200212200049. The reversal of 1200212200021 is 1200022120021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1200212200021 - 2²¹ = 1200210102869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200212199974 and 1200212200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200212200721) 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, 7082086 + ... + 7249576.

It is an arithmetic number, because the mean of its divisors is an integer number (79592198400).

Almost surely, 2^{1200212200021} is an apocalyptic number.

It is an amenable number.

1200212200021 is a deficient number, since it is larger than the sum of its proper divisors (73262974379).

1200212200021 is a wasteful number, since it uses less digits than its factorization.

1200212200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170520.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1200212200021 its reverse (1200022120021), we get a palindrome (2400234320042).

The spelling of 1200212200021 in words is "one trillion, two hundred billion, two hundred twelve million, two hundred thousand, twenty-one".