21310746 has 16 divisors (see below), whose sum is σ = 42677184. Its totient is φ = 7094304.

The previous prime is 21310739. The next prime is 21310747. The reversal of 21310746 is 64701312.

It is not an unprimeable number, because it can be changed into a prime (21310747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3966 + ... + 7638.

It is an arithmetic number, because the mean of its divisors is an integer number (2667324).

Almost surely, 2^21310746 is an apocalyptic number.

21310746 is an abundant number, since it is smaller than the sum of its proper divisors (21366438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21310746 is a wasteful number, since it uses less digits than its factorization.

21310746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4645.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21310746 is about 4616.3563553955. The cubic root of 21310746 is about 277.2465927857.

It can be divided in two parts, 2131074 and 6, that added together give a triangular number (2131080 = T₂₀₆₄).

The spelling of 21310746 in words is "twenty-one million, three hundred ten thousand, seven hundred forty-six".