21235982 has 4 divisors (see below), whose sum is σ = 31853976. Its totient is φ = 10617990.

The previous prime is 21235979. The next prime is 21235993. The reversal of 21235982 is 28953212.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308994 + ... + 5308997.

It is an arithmetic number, because the mean of its divisors is an integer number (7963494).

Almost surely, 2^21235982 is an apocalyptic number.

21235982 is a deficient number, since it is larger than the sum of its proper divisors (10617994).

21235982 is a wasteful number, since it uses less digits than its factorization.

21235982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10617993.

The product of its digits is 8640, while the sum is 32.

The square root of 21235982 is about 4608.2515122332. The cubic root of 21235982 is about 276.9219936132.

The spelling of 21235982 in words is "twenty-one million, two hundred thirty-five thousand, nine hundred eighty-two".