21113133331021 has 8 divisors (see below), whose sum is σ = 21123305455104. Its totient is φ = 21102962107920.

The previous prime is 21113133331019. The next prime is 21113133331097. The reversal of 21113133331021 is 12013333131112.

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 21113133331021 - 2¹ = 21113133331019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113133331921) 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, 49258191 + ... + 49684963.

It is an arithmetic number, because the mean of its divisors is an integer number (2640413181888).

Almost surely, 2^{21113133331021} is an apocalyptic number.

It is an amenable number.

21113133331021 is a deficient number, since it is larger than the sum of its proper divisors (10172124083).

21113133331021 is a wasteful number, since it uses less digits than its factorization.

21113133331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450491.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 21113133331021 its reverse (12013333131112), we get a palindrome (33126466462133).

The spelling of 21113133331021 in words is "twenty-one trillion, one hundred thirteen billion, one hundred thirty-three million, three hundred thirty-one thousand, twenty-one".