21324770 has 8 divisors (see below), whose sum is σ = 38384604. Its totient is φ = 8529904.

The previous prime is 21324769. The next prime is 21324781. The reversal of 21324770 is 7742312.

It can be written as a sum of positive squares in 2 ways, for example, as 17280649 + 4044121 = 4157^2 + 2011^2 .

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

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, 1066229 + ... + 1066248.

Almost surely, 2^21324770 is an apocalyptic number.

21324770 is a deficient number, since it is larger than the sum of its proper divisors (17059834).

21324770 is a wasteful number, since it uses less digits than its factorization.

21324770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132484.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 21324770 is about 4617.8750524457. The cubic root of 21324770 is about 277.3073955006.

The spelling of 21324770 in words is "twenty-one million, three hundred twenty-four thousand, seven hundred seventy".