121002010021 has 4 divisors (see below), whose sum is σ = 121033881612. Its totient is φ = 120970138432.

The previous prime is 121002010009. The next prime is 121002010033. The reversal of 121002010021 is 120010200121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120010200121 = 7 ⋅17144314303.

It is an interprime number because it is at equal distance from previous prime (121002010009) and next prime (121002010033).

It can be written as a sum of positive squares in 2 ways, for example, as 9295659396 + 111706350625 = 96414^2 + 334225^2 .

It is a cyclic number.

It is not a de Polignac number, because 121002010021 - 2²⁵ = 120968455589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002010001) 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, 15930100 + ... + 15937693.

It is an arithmetic number, because the mean of its divisors is an integer number (30258470403).

Almost surely, 2^121002010021 is an apocalyptic number.

It is an amenable number.

121002010021 is a deficient number, since it is larger than the sum of its proper divisors (31871591).

121002010021 is an equidigital number, since it uses as much as digits as its factorization.

121002010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31871590.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121002010021 its reverse (120010200121), we get a palindrome (241012210142).

The spelling of 121002010021 in words is "one hundred twenty-one billion, two million, ten thousand, twenty-one".