21701470 has 16 divisors (see below), whose sum is σ = 44643168. Its totient is φ = 7440480.

The previous prime is 21701467. The next prime is 21701473. The reversal of 21701470 is 7410712.

It is an interprime number because it is at equal distance from previous prime (21701467) and next prime (21701473).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701473) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 154941 + ... + 155080.

It is an arithmetic number, because the mean of its divisors is an integer number (2790198).

Almost surely, 2^21701470 is an apocalyptic number.

21701470 is an abundant number, since it is smaller than the sum of its proper divisors (22941698).

21701470 is a wasteful number, since it uses less digits than its factorization.

21701470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310035.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21701470 is about 4658.4836588744. The cubic root of 21701470 is about 278.9307433772.

The spelling of 21701470 in words is "twenty-one million, seven hundred one thousand, four hundred seventy".