21702010 has 32 divisors (see below), whose sum is σ = 43146432. Its totient is φ = 7793280.

The previous prime is 21702001. The next prime is 21702049. The reversal of 21702010 is 1020712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7942 + ... + 10318.

It is an arithmetic number, because the mean of its divisors is an integer number (1348326).

Almost surely, 2^21702010 is an apocalyptic number.

21702010 is a deficient number, since it is larger than the sum of its proper divisors (21444422).

21702010 is a wasteful number, since it uses less digits than its factorization.

21702010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 21702010 is about 4658.5416172875. The cubic root of 21702010 is about 278.9330569125.

Adding to 21702010 its reverse (1020712), we get a palindrome (22722722).

The spelling of 21702010 in words is "twenty-one million, seven hundred two thousand, ten".