21253682 has 8 divisors (see below), whose sum is σ = 32558976. Its totient is φ = 10400692.

The previous prime is 21253667. The next prime is 21253697. The reversal of 21253682 is 28635212.

It is an interprime number because it is at equal distance from previous prime (21253667) and next prime (21253697).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112958 + ... + 113145.

It is an arithmetic number, because the mean of its divisors is an integer number (4069872).

Almost surely, 2^21253682 is an apocalyptic number.

21253682 is a deficient number, since it is larger than the sum of its proper divisors (11305294).

21253682 is a wasteful number, since it uses less digits than its factorization.

21253682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226152.

The product of its digits is 5760, while the sum is 29.

The square root of 21253682 is about 4610.1715803211. The cubic root of 21253682 is about 276.9989095779.

Adding to 21253682 its reverse (28635212), we get a palindrome (49888894).

The spelling of 21253682 in words is "twenty-one million, two hundred fifty-three thousand, six hundred eighty-two".