21304403031 has 8 divisors (see below), whose sum is σ = 28407170304. Its totient is φ = 14202285560.

The previous prime is 21304402963. The next prime is 21304403059. The reversal of 21304403031 is 13030440312.

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 21304403031 - 2¹¹ = 21304400983 is a prime.

It is a super-2 number, since 2×21304403031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21304402989 and 21304403007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304401031) 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, 79965 + ... + 221366.

It is an arithmetic number, because the mean of its divisors is an integer number (3550896288).

Almost surely, 2^21304403031 is an apocalyptic number.

21304403031 is a deficient number, since it is larger than the sum of its proper divisors (7102767273).

21304403031 is a wasteful number, since it uses less digits than its factorization.

21304403031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324901.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21304403031 its reverse (13030440312), we get a palindrome (34334843343).

The spelling of 21304403031 in words is "twenty-one billion, three hundred four million, four hundred three thousand, thirty-one".