21756034 has 8 divisors (see below), whose sum is σ = 32770188. Its totient is φ = 10832640.

The previous prime is 21755959. The next prime is 21756041. The reversal of 21756034 is 43065712.

It can be written as a sum of positive squares in 2 ways, for example, as 21650409 + 105625 = 4653^2 + 325^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21755993 and 21756011.

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, 22087 + ... + 23050.

Almost surely, 2^21756034 is an apocalyptic number.

21756034 is a deficient number, since it is larger than the sum of its proper divisors (11014154).

21756034 is a wasteful number, since it uses less digits than its factorization.

21756034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45380.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21756034 is about 4664.3363943867. The cubic root of 21756034 is about 279.1643195565.

The spelling of 21756034 in words is "twenty-one million, seven hundred fifty-six thousand, thirty-four".