21031468 has 12 divisors (see below), whose sum is σ = 36904840. Its totient is φ = 10487232.

The previous prime is 21031463. The next prime is 21031471. The reversal of 21031468 is 86413012.

It is not an unprimeable number, because it can be changed into a prime (21031463) 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, 5421 + ... + 8452.

Almost surely, 2^21031468 is an apocalyptic number.

It is an amenable number.

21031468 is a deficient number, since it is larger than the sum of its proper divisors (15873372).

21031468 is a wasteful number, since it uses less digits than its factorization.

21031468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14256 (or 14254 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21031468 is about 4586.0078499715. The cubic root of 21031468 is about 276.0301549353.

The spelling of 21031468 in words is "twenty-one million, thirty-one thousand, four hundred sixty-eight".