21428762 has 8 divisors (see below), whose sum is σ = 32213376. Its totient is φ = 10690972.

The previous prime is 21428747. The next prime is 21428791. The reversal of 21428762 is 26782412.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10538 + ... + 12405.

It is an arithmetic number, because the mean of its divisors is an integer number (4026672).

Almost surely, 2^21428762 is an apocalyptic number.

21428762 is a deficient number, since it is larger than the sum of its proper divisors (10784614).

21428762 is a wasteful number, since it uses less digits than its factorization.

21428762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23412.

The product of its digits is 10752, while the sum is 32.

The square root of 21428762 is about 4629.1210828839. The cubic root of 21428762 is about 277.7574355355.

The spelling of 21428762 in words is "twenty-one million, four hundred twenty-eight thousand, seven hundred sixty-two".