121200021112021 has 4 divisors (see below), whose sum is σ = 121259754983500. Its totient is φ = 121140287240544.

The previous prime is 121200021111973. The next prime is 121200021112111. The reversal of 121200021112021 is 120211120002121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85090570047025 + 36109451064996 = 9224455^2 + 6009114^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200021112021 - 2¹³ = 121200021103829 is a prime.

It is a super-2 number, since 2×121200021112021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200021111986 and 121200021112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200021115021) 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, 29866932696 + ... + 29866936753.

It is an arithmetic number, because the mean of its divisors is an integer number (30314938745875).

Almost surely, 2^{121200021112021} is an apocalyptic number.

It is an amenable number.

121200021112021 is a deficient number, since it is larger than the sum of its proper divisors (59733871479).

121200021112021 is an equidigital number, since it uses as much as digits as its factorization.

121200021112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59733871478.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121200021112021 its reverse (120211120002121), we get a palindrome (241411141114142).

The spelling of 121200021112021 in words is "one hundred twenty-one trillion, two hundred billion, twenty-one million, one hundred twelve thousand, twenty-one".