21152342 has 8 divisors (see below), whose sum is σ = 31752336. Its totient is φ = 10568232.

The previous prime is 21152333. The next prime is 21152381. The reversal of 21152342 is 24325112.

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

It is a congruent number.

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, 263 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (3969042).

Almost surely, 2^21152342 is an apocalyptic number.

21152342 is a deficient number, since it is larger than the sum of its proper divisors (10599994).

21152342 is a wasteful number, since it uses less digits than its factorization.

21152342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7942.

The product of its digits is 480, while the sum is 20.

The square root of 21152342 is about 4599.1675333695. The cubic root of 21152342 is about 276.5579537721.

Adding to 21152342 its reverse (24325112), we get a palindrome (45477454).

The spelling of 21152342 in words is "twenty-one million, one hundred fifty-two thousand, three hundred forty-two".