21113333021 has 8 divisors (see below), whose sum is σ = 23035610304. Its totient is φ = 19191536320.

The previous prime is 21113333009. The next prime is 21113333041. The reversal of 21113333021 is 12033331112.

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

It is not a de Polignac number, because 21113333021 - 2⁶ = 21113332957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113332984 and 21113333002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113333041) 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, 25001 + ... + 207006.

It is an arithmetic number, because the mean of its divisors is an integer number (2879451288).

Almost surely, 2^21113333021 is an apocalyptic number.

It is an amenable number.

21113333021 is a deficient number, since it is larger than the sum of its proper divisors (1922277283).

21113333021 is a wasteful number, since it uses less digits than its factorization.

21113333021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240291.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21113333021 its reverse (12033331112), we get a palindrome (33146664133).

The spelling of 21113333021 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty-three thousand, twenty-one".