121102002110021 has 4 divisors (see below), whose sum is σ = 122173701243852. Its totient is φ = 120030302976192.

The previous prime is 121102002109987. The next prime is 121102002110059. The reversal of 121102002110021 is 120011200201121.

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 2439890860225 + 118662111249796 = 1562015^2 + 10893214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121102002110021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121102002109978 and 121102002110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102002110071) 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, 535849566746 + ... + 535849566971.

It is an arithmetic number, because the mean of its divisors is an integer number (30543425310963).

Almost surely, 2^{121102002110021} is an apocalyptic number.

It is an amenable number.

121102002110021 is a deficient number, since it is larger than the sum of its proper divisors (1071699133831).

121102002110021 is a wasteful number, since it uses less digits than its factorization.

121102002110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071699133830.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121102002110021 its reverse (120011200201121), we get a palindrome (241113202311142).

The spelling of 121102002110021 in words is "one hundred twenty-one trillion, one hundred two billion, two million, one hundred ten thousand, twenty-one".