121102030021 has 4 divisors (see below), whose sum is σ = 138402320032. Its totient is φ = 103801740012.

The previous prime is 121102029967. The next prime is 121102030033. The reversal of 121102030021 is 120030201121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121102030021 - 2¹⁷ = 121101898949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121102029983 and 121102030010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102030051) 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, 8650144995 + ... + 8650145008.

It is an arithmetic number, because the mean of its divisors is an integer number (34600580008).

Almost surely, 2^121102030021 is an apocalyptic number.

It is an amenable number.

121102030021 is a deficient number, since it is larger than the sum of its proper divisors (17300290011).

121102030021 is an equidigital number, since it uses as much as digits as its factorization.

121102030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17300290010.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 121102030021 its reverse (120030201121), we get a palindrome (241132231142).

The spelling of 121102030021 in words is "one hundred twenty-one billion, one hundred two million, thirty thousand, twenty-one".