121123203021 has 6 divisors (see below), whose sum is σ = 174955737710. Its totient is φ = 80748802008.

The previous prime is 121123203001. The next prime is 121123203023. The reversal of 121123203021 is 120302321121.

It can be written as a sum of positive squares in only one way, i.e., 66208436100 + 54914766921 = 257310^2 + 234339^2 .

It is not a de Polignac number, because 121123203021 - 2⁵ = 121123202989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121123202985 and 121123203003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123203023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6729066826 + ... + 6729066843.

Almost surely, 2^121123203021 is an apocalyptic number.

It is an amenable number.

121123203021 is a deficient number, since it is larger than the sum of its proper divisors (53832534689).

121123203021 is a wasteful number, since it uses less digits than its factorization.

121123203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13458133675 (or 13458133672 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 121123203021 its reverse (120302321121), we get a palindrome (241425524142).

The spelling of 121123203021 in words is "one hundred twenty-one billion, one hundred twenty-three million, two hundred three thousand, twenty-one".