21004040031 has 8 divisors (see below), whose sum is σ = 30159647280. Its totient is φ = 12925563072.

The previous prime is 21004040027. The next prime is 21004040033. The reversal of 21004040031 is 13004040012.

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

It is not a de Polignac number, because 21004040031 - 2² = 21004040027 is a prime.

It is a super-2 number, since 2×21004040031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004040033) 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, 269282526 + ... + 269282603.

It is an arithmetic number, because the mean of its divisors is an integer number (3769955910).

Almost surely, 2^21004040031 is an apocalyptic number.

21004040031 is a deficient number, since it is larger than the sum of its proper divisors (9155607249).

21004040031 is a wasteful number, since it uses less digits than its factorization.

21004040031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538565145.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21004040031 its reverse (13004040012), we get a palindrome (34008080043).

The spelling of 21004040031 in words is "twenty-one billion, four million, forty thousand, thirty-one".