21364782 has 8 divisors (see below), whose sum is σ = 42729576. Its totient is φ = 7121592.

The previous prime is 21364771. The next prime is 21364807. The reversal of 21364782 is 28746312.

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

21364782 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1780393 + ... + 1780404.

It is an arithmetic number, because the mean of its divisors is an integer number (5341197).

Almost surely, 2^21364782 is an apocalyptic number.

21364782 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21364782 is a wasteful number, since it uses less digits than its factorization.

21364782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560802.

The product of its digits is 16128, while the sum is 33.

The square root of 21364782 is about 4622.2053178110. The cubic root of 21364782 is about 277.4807258750.

The spelling of 21364782 in words is "twenty-one million, three hundred sixty-four thousand, seven hundred eighty-two".