21834760 has 32 divisors (see below), whose sum is σ = 49267800. Its totient is φ = 8709120.

The previous prime is 21834737. The next prime is 21834793. The reversal of 21834760 is 6743812.

It can be written as a sum of positive squares in 4 ways, for example, as 14577124 + 7257636 = 3818^2 + 2694^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21136 + ... + 22144.

Almost surely, 2^21834760 is an apocalyptic number.

21834760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21834760 is an abundant number, since it is smaller than the sum of its proper divisors (27433040).

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

21834760 is a wasteful number, since it uses less digits than its factorization.

21834760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21834760 is about 4672.7679163425. The cubic root of 21834760 is about 279.5006405708.

The spelling of 21834760 in words is "twenty-one million, eight hundred thirty-four thousand, seven hundred sixty".