1200111001021 has 4 divisors (see below), whose sum is σ = 1214570169792. Its totient is φ = 1185651832252.

The previous prime is 1200111001013. The next prime is 1200111001049. The reversal of 1200111001021 is 1201001110021.

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 1200111001021 - 2³ = 1200111001013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200111000989 and 1200111001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111001121) 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, 7229584261 + ... + 7229584426.

It is an arithmetic number, because the mean of its divisors is an integer number (303642542448).

Almost surely, 2^{1200111001021} is an apocalyptic number.

It is an amenable number.

1200111001021 is a deficient number, since it is larger than the sum of its proper divisors (14459168771).

1200111001021 is an equidigital number, since it uses as much as digits as its factorization.

1200111001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14459168770.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1200111001021 its reverse (1201001110021), we get a palindrome (2401112111042).

The spelling of 1200111001021 in words is "one trillion, two hundred billion, one hundred eleven million, one thousand, twenty-one".