21000313233021 has 8 divisors (see below), whose sum is σ = 28683354659904. Its totient is φ = 13658740314080.

The previous prime is 21000313232929. The next prime is 21000313233049. The reversal of 21000313233021 is 12033231300012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000313233021 - 2⁷ = 21000313232893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000313233421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85367126841 + ... + 85367127086.

It is an arithmetic number, because the mean of its divisors is an integer number (3585419332488).

Almost surely, 2^{21000313233021} is an apocalyptic number.

It is an amenable number.

21000313233021 is a deficient number, since it is larger than the sum of its proper divisors (7683041426883).

21000313233021 is a wasteful number, since it uses less digits than its factorization.

21000313233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170734253971.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21000313233021 its reverse (12033231300012), we get a palindrome (33033544533033).

The spelling of 21000313233021 in words is "twenty-one trillion, three hundred thirteen million, two hundred thirty-three thousand, twenty-one".