21702834 has 12 divisors (see below), whose sum is σ = 47022846. Its totient is φ = 7234272.

The previous prime is 21702833. The next prime is 21702851. The reversal of 21702834 is 43820712.

It can be written as a sum of positive squares in only one way, i.e., 11799225 + 9903609 = 3435^2 + 3147^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21702798 and 21702807.

It is not an unprimeable number, because it can be changed into a prime (21702833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 602839 + ... + 602874.

Almost surely, 2^21702834 is an apocalyptic number.

21702834 is an abundant number, since it is smaller than the sum of its proper divisors (25320012).

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

21702834 is a wasteful number, since it uses less digits than its factorization.

21702834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205721 (or 1205718 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21702834 is about 4658.6300561431. The cubic root of 21702834 is about 278.9365871221.

The spelling of 21702834 in words is "twenty-one million, seven hundred two thousand, eight hundred thirty-four".