121332100021 has 16 divisors (see below), whose sum is σ = 136516969728. Its totient is φ = 106886152000.

The previous prime is 121332100013. The next prime is 121332100139. The reversal of 121332100021 is 120001233121.

It is a cyclic number.

It is not a de Polignac number, because 121332100021 - 2³ = 121332100013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121332099968 and 121332100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121332100321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1109590 + ... + 1214023.

It is an arithmetic number, because the mean of its divisors is an integer number (8532310608).

Almost surely, 2^121332100021 is an apocalyptic number.

121332100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121332100021 is a deficient number, since it is larger than the sum of its proper divisors (15184869707).

121332100021 is a wasteful number, since it uses less digits than its factorization.

121332100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323772.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 121332100021 its reverse (120001233121), we get a palindrome (241333333142).

The spelling of 121332100021 in words is "one hundred twenty-one billion, three hundred thirty-two million, one hundred thousand, twenty-one".