1200121202021 has 12 divisors (see below), whose sum is σ = 1396180029132. Its totient is φ = 1028586400128.

The previous prime is 1200121202017. The next prime is 1200121202023. The reversal of 1200121202021 is 1202021210021.

It can be written as a sum of positive squares in 2 ways, for example, as 292017028996 + 908104173025 = 540386^2 + 952945^2 .

It is not a de Polignac number, because 1200121202021 - 2² = 1200121202017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200121201987 and 1200121202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121202023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 482690 + ... + 1622723.

It is an arithmetic number, because the mean of its divisors is an integer number (116348335761).

Almost surely, 2^{1200121202021} is an apocalyptic number.

It is an amenable number.

1200121202021 is a deficient number, since it is larger than the sum of its proper divisors (196058827111).

1200121202021 is a wasteful number, since it uses less digits than its factorization.

1200121202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117060 (or 2117053 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1200121202021 its reverse (1202021210021), we get a palindrome (2402142412042).

The spelling of 1200121202021 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred two thousand, twenty-one".