21253702 has 16 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 10084360.

The previous prime is 21253697. The next prime is 21253711. The reversal of 21253702 is 20735212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4263 + ... + 7789.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^21253702 is an apocalyptic number.

21253702 is a deficient number, since it is larger than the sum of its proper divisors (12276410).

21253702 is a wasteful number, since it uses less digits than its factorization.

21253702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21253702 is about 4610.1737494372. The cubic root of 21253702 is about 276.9989964645.

Adding to 21253702 its reverse (20735212), we get a palindrome (41988914).

The spelling of 21253702 in words is "twenty-one million, two hundred fifty-three thousand, seven hundred two".