21210342 has 8 divisors (see below), whose sum is σ = 42420696. Its totient is φ = 7070112.

The previous prime is 21210337. The next prime is 21210367. The reversal of 21210342 is 24301212.

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

21210342 is an admirable number.

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, 1767523 + ... + 1767534.

It is an arithmetic number, because the mean of its divisors is an integer number (5302587).

Almost surely, 2^21210342 is an apocalyptic number.

21210342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210342 is a wasteful number, since it uses less digits than its factorization.

21210342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535062.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21210342 is about 4605.4687057888. The cubic root of 21210342 is about 276.8104982681.

Adding to 21210342 its reverse (24301212), we get a palindrome (45511554).

The spelling of 21210342 in words is "twenty-one million, two hundred ten thousand, three hundred forty-two".