21331230100121 has 16 divisors (see below), whose sum is σ = 23229321696000. Its totient is φ = 19520438256000.

The previous prime is 21331230100069. The next prime is 21331230100127. The reversal of 21331230100121 is 12100103213312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21331230100121 - 2³⁰ = 21330156358297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21331230100093 and 21331230100102.

It is not an unprimeable number, because it can be changed into a prime (21331230100127) 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 15 ways as a sum of consecutive naturals, for example, 135479921 + ... + 135637278.

It is an arithmetic number, because the mean of its divisors is an integer number (1451832606000).

Almost surely, 2^{21331230100121} is an apocalyptic number.

It is an amenable number.

21331230100121 is a deficient number, since it is larger than the sum of its proper divisors (1898091595879).

21331230100121 is a wasteful number, since it uses less digits than its factorization.

21331230100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271117360.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21331230100121 its reverse (12100103213312), we get a palindrome (33431333313433).

The spelling of 21331230100121 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred thirty million, one hundred thousand, one hundred twenty-one".