21001342 has 8 divisors (see below), whose sum is σ = 31527000. Its totient is φ = 10492344.

The previous prime is 21001319. The next prime is 21001349. The reversal of 21001342 is 24310012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (3940875).

Almost surely, 2^21001342 is an apocalyptic number.

21001342 is a deficient number, since it is larger than the sum of its proper divisors (10525658).

21001342 is a wasteful number, since it uses less digits than its factorization.

21001342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21001342 is about 4582.7221168210. The cubic root of 21001342 is about 275.8982944593.

Adding to 21001342 its reverse (24310012), we get a palindrome (45311354).

The spelling of 21001342 in words is "twenty-one million, one thousand, three hundred forty-two".