21140443031 has 8 divisors (see below), whose sum is σ = 22089300480. Its totient is φ = 20194061272.

The previous prime is 21140443021. The next prime is 21140443057. The reversal of 21140443031 is 13034404112.

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

It is not a de Polignac number, because 21140443031 - 2²⁶ = 21073334167 is a prime.

It is a super-2 number, since 2×21140443031² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21140442988 and 21140443006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140443021) 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, 601451 + ... + 635628.

It is an arithmetic number, because the mean of its divisors is an integer number (2761162560).

Almost surely, 2^21140443031 is an apocalyptic number.

21140443031 is a deficient number, since it is larger than the sum of its proper divisors (948857449).

21140443031 is a wasteful number, since it uses less digits than its factorization.

21140443031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237845.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21140443031 its reverse (13034404112), we get a palindrome (34174847143).

The spelling of 21140443031 in words is "twenty-one billion, one hundred forty million, four hundred forty-three thousand, thirty-one".