1200121110021 has 8 divisors (see below), whose sum is σ = 1694288625984. Its totient is φ = 753017167040.

The previous prime is 1200121110011. The next prime is 1200121110029. The reversal of 1200121110021 is 1200111210021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200121110021 - 2¹⁴ = 1200121093637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200121109979 and 1200121110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121110029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11765893185 + ... + 11765893286.

It is an arithmetic number, because the mean of its divisors is an integer number (211786078248).

Almost surely, 2^{1200121110021} is an apocalyptic number.

It is an amenable number.

1200121110021 is a deficient number, since it is larger than the sum of its proper divisors (494167515963).

1200121110021 is a wasteful number, since it uses less digits than its factorization.

1200121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23531786491.

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

Adding to 1200121110021 its reverse (1200111210021), we get a palindrome (2400232320042).

The spelling of 1200121110021 in words is "one trillion, two hundred billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".