21111230013021 has 12 divisors (see below), whose sum is σ = 30494143591548. Its totient is φ = 14074086564864.

The previous prime is 21111230012989. The next prime is 21111230013031. The reversal of 21111230013021 is 12031003211112.

21111230013021 is a `hidden beast` number, since 21 + 111 + 230 + 0 + 1 + 302 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14219581224996 + 6891648788025 = 3770886^2 + 2625195^2 .

It is not a de Polignac number, because 21111230013021 - 2⁵ = 21111230012989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111230012985 and 21111230013003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111230013031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3523090 + ... + 7391523.

It is an arithmetic number, because the mean of its divisors is an integer number (2541178632629).

Almost surely, 2^{21111230013021} is an apocalyptic number.

It is an amenable number.

21111230013021 is a deficient number, since it is larger than the sum of its proper divisors (9382913578527).

21111230013021 is a wasteful number, since it uses less digits than its factorization.

21111230013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11129532 (or 11129529 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21111230013021 its reverse (12031003211112), we get a palindrome (33142233224133).

The spelling of 21111230013021 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirty million, thirteen thousand, twenty-one".