21233210010021 has 24 divisors (see below), whose sum is σ = 30878051195160. Its totient is φ = 14059700637696.

The previous prime is 21233210009989. The next prime is 21233210010053. The reversal of 21233210010021 is 12001001233212.

21233210010021 is a `hidden beast` number, since 212 + 332 + 1 + 0 + 0 + 100 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (21233210009989) and next prime (21233210010053).

It can be written as a sum of positive squares in 4 ways, for example, as 5553629544996 + 15679580465025 = 2356614^2 + 3959745^2 .

It is not a de Polignac number, because 21233210010021 - 2⁵ = 21233210009989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21233210009976 and 21233210010003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233210010071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5186796 + ... + 8328821.

It is an arithmetic number, because the mean of its divisors is an integer number (1286585466465).

Almost surely, 2^{21233210010021} is an apocalyptic number.

It is an amenable number.

21233210010021 is a deficient number, since it is larger than the sum of its proper divisors (9644841185139).

21233210010021 is a wasteful number, since it uses less digits than its factorization.

21233210010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13516805 (or 13516802 counting only the distinct ones).

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

Adding to 21233210010021 its reverse (12001001233212), we get a palindrome (33234211243233).

The spelling of 21233210010021 in words is "twenty-one trillion, two hundred thirty-three billion, two hundred ten million, ten thousand, twenty-one".