121123210021 has 8 divisors (see below), whose sum is σ = 132716503584. Its totient is φ = 109626931920.

The previous prime is 121123209971. The next prime is 121123210057. The reversal of 121123210021 is 120012321121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121123210021 - 2³⁵ = 86763471653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121123209977 and 121123210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123210081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24251250 + ... + 24256243.

It is an arithmetic number, because the mean of its divisors is an integer number (16589562948).

Almost surely, 2^121123210021 is an apocalyptic number.

121123210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121123210021 is a deficient number, since it is larger than the sum of its proper divisors (11593293563).

121123210021 is a wasteful number, since it uses less digits than its factorization.

121123210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48507731.

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

Adding to 121123210021 its reverse (120012321121), we get a palindrome (241135531142).

Subtracting from 121123210021 its reverse (120012321121), we obtain a square (1110888900 = 33330²).

It can be divided in two parts, 1211 and 23210021, that added together give a palindrome (23211232).

The spelling of 121123210021 in words is "one hundred twenty-one billion, one hundred twenty-three million, two hundred ten thousand, twenty-one".