1200012111021 has 16 divisors (see below), whose sum is σ = 1684280100800. Its totient is φ = 757878726528.

The previous prime is 1200012111017. The next prime is 1200012111061. The reversal of 1200012111021 is 1201112100021.

It is not a de Polignac number, because 1200012111021 - 2² = 1200012111017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200012110988 and 1200012111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200012111061) 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, 1613115 + ... + 2236551.

It is an arithmetic number, because the mean of its divisors is an integer number (105267506300).

Almost surely, 2^{1200012111021} is an apocalyptic number.

It is an amenable number.

1200012111021 is a deficient number, since it is larger than the sum of its proper divisors (484267989779).

1200012111021 is a wasteful number, since it uses less digits than its factorization.

1200012111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657228.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1200012111021 its reverse (1201112100021), we get a palindrome (2401124211042).

The spelling of 1200012111021 in words is "one trillion, two hundred billion, twelve million, one hundred eleven thousand, twenty-one".