121012120030021 has 4 divisors (see below), whose sum is σ = 132013221850944. Its totient is φ = 110011018209100.

The previous prime is 121012120029967. The next prime is 121012120030033. The reversal of 121012120030021 is 120030021210121.

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 121012120030021 - 2¹¹ = 121012120027973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121012120029977 and 121012120030004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012120031021) 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, 5500550910445 + ... + 5500550910466.

It is an arithmetic number, because the mean of its divisors is an integer number (33003305462736).

Almost surely, 2^{121012120030021} is an apocalyptic number.

121012120030021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121012120030021 is a deficient number, since it is larger than the sum of its proper divisors (11001101820923).

121012120030021 is a wasteful number, since it uses less digits than its factorization.

121012120030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11001101820922.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121012120030021 its reverse (120030021210121), we get a palindrome (241042141240142).

The spelling of 121012120030021 in words is "one hundred twenty-one trillion, twelve billion, one hundred twenty million, thirty thousand, twenty-one".