21286702 has 4 divisors (see below), whose sum is σ = 31930056. Its totient is φ = 10643350.

The previous prime is 21286693. The next prime is 21286709. The reversal of 21286702 is 20768212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21286709) 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 as a sum of consecutive naturals, namely, 5321674 + ... + 5321677.

It is an arithmetic number, because the mean of its divisors is an integer number (7982514).

Almost surely, 2^21286702 is an apocalyptic number.

21286702 is a deficient number, since it is larger than the sum of its proper divisors (10643354).

21286702 is a wasteful number, since it uses less digits than its factorization.

21286702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643353.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21286702 is about 4613.7514020588. The cubic root of 21286702 is about 277.1422850704.

The spelling of 21286702 in words is "twenty-one million, two hundred eighty-six thousand, seven hundred two".