21304402031 has 8 divisors (see below), whose sum is σ = 23243735424. Its totient is φ = 19365496920.

The previous prime is 21304401991. The next prime is 21304402121. The reversal of 21304402031 is 13020440312.

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

It is not a de Polignac number, because 21304402031 - 2¹⁰ = 21304401007 is a prime.

It is a super-2 number, since 2×21304402031² (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 = 21304401994 and 21304402012.

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, 1760 + ... + 206426.

It is an arithmetic number, because the mean of its divisors is an integer number (2905466928).

Almost surely, 2^21304402031 is an apocalyptic number.

21304402031 is a deficient number, since it is larger than the sum of its proper divisors (1939333393).

21304402031 is a wasteful number, since it uses less digits than its factorization.

21304402031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214141.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21304402031 its reverse (13020440312), we get a palindrome (34324842343).

The spelling of 21304402031 in words is "twenty-one billion, three hundred four million, four hundred two thousand, thirty-one".