21085702 has 24 divisors (see below), whose sum is σ = 35184312. Its totient is φ = 9476720.

The previous prime is 21085643. The next prime is 21085703. The reversal of 21085702 is 20758012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21085703) 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 11 ways as a sum of consecutive naturals, for example, 236874 + ... + 236962.

It is an arithmetic number, because the mean of its divisors is an integer number (1466013).

Almost surely, 2^21085702 is an apocalyptic number.

21085702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21085702 is a deficient number, since it is larger than the sum of its proper divisors (14098610).

21085702 is an frugal number, since it uses more digits than its factorization.

21085702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 21085702 is about 4591.9170288671. The cubic root of 21085702 is about 276.2672182712.

The spelling of 21085702 in words is "twenty-one million, eighty-five thousand, seven hundred two".