21301000031 has 4 divisors (see below), whose sum is σ = 21540337200. Its totient is φ = 21061662864.

The previous prime is 21301000027. The next prime is 21301000037. The reversal of 21301000031 is 13000010312.

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 21301000031 - 2² = 21301000027 is a prime.

It is a super-2 number, since 2×21301000031² (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 = 21300999976 and 21301000021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301000037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119668451 + ... + 119668628.

It is an arithmetic number, because the mean of its divisors is an integer number (5385084300).

Almost surely, 2^21301000031 is an apocalyptic number.

21301000031 is a deficient number, since it is larger than the sum of its proper divisors (239337169).

21301000031 is an equidigital number, since it uses as much as digits as its factorization.

21301000031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239337168.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21301000031 its reverse (13000010312), we get a palindrome (34301010343).

The spelling of 21301000031 in words is "twenty-one billion, three hundred one million, thirty-one", and thus it is an aban number.