21026342 has 8 divisors (see below), whose sum is σ = 32010456. Its totient is φ = 10356192.

The previous prime is 21026333. The next prime is 21026351. The reversal of 21026342 is 24362012.

It is an interprime number because it is at equal distance from previous prime (21026333) and next prime (21026351).

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, 78323 + ... + 78590.

It is an arithmetic number, because the mean of its divisors is an integer number (4001307).

Almost surely, 2^21026342 is an apocalyptic number.

21026342 is a deficient number, since it is larger than the sum of its proper divisors (10984114).

21026342 is a wasteful number, since it uses less digits than its factorization.

21026342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156982.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21026342 is about 4585.4489420339. The cubic root of 21026342 is about 276.0077275019.

Adding to 21026342 its reverse (24362012), we get a palindrome (45388354).

The spelling of 21026342 in words is "twenty-one million, twenty-six thousand, three hundred forty-two".