21460031 has 4 divisors (see below), whose sum is σ = 21471000. Its totient is φ = 21449064.

The previous prime is 21460007. The next prime is 21460057. The reversal of 21460031 is 13006412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21460031 - 2¹⁸ = 21197887 is a prime.

It is a super-2 number, since 2×21460031² = 921065861041922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21459991 and 21460009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (5367750).

Almost surely, 2^21460031 is an apocalyptic number.

21460031 is a deficient number, since it is larger than the sum of its proper divisors (10969).

21460031 is an equidigital number, since it uses as much as digits as its factorization.

21460031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10968.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21460031 is about 4632.4972746889. The cubic root of 21460031 is about 277.8924717417.

Adding to 21460031 its reverse (13006412), we get a palindrome (34466443).

The spelling of 21460031 in words is "twenty-one million, four hundred sixty thousand, thirty-one".