21113332031 has 4 divisors (see below), whose sum is σ = 23032725864. Its totient is φ = 19193938200.

The previous prime is 21113332021. The next prime is 21113332033. The reversal of 21113332031 is 13023331112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21113332031 - 2¹⁰ = 21113331007 is a prime.

It is a super-2 number, since 2×21113332031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113331994 and 21113332012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113332033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959696900 + ... + 959696921.

It is an arithmetic number, because the mean of its divisors is an integer number (5758181466).

Almost surely, 2^21113332031 is an apocalyptic number.

21113332031 is a deficient number, since it is larger than the sum of its proper divisors (1919393833).

21113332031 is a wasteful number, since it uses less digits than its factorization.

21113332031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919393832.

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

Adding to 21113332031 its reverse (13023331112), we get a palindrome (34136663143).

The spelling of 21113332031 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty-two thousand, thirty-one".