21734142 has 8 divisors (see below), whose sum is σ = 43468296. Its totient is φ = 7244712.

The previous prime is 21734129. The next prime is 21734147. The reversal of 21734142 is 24143712.

It is a happy number.

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

21734142 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734147) 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, 1811173 + ... + 1811184.

It is an arithmetic number, because the mean of its divisors is an integer number (5433537).

Almost surely, 2^21734142 is an apocalyptic number.

21734142 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.

21734142 is a wasteful number, since it uses less digits than its factorization.

21734142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622362.

The product of its digits is 1344, while the sum is 24.

The square root of 21734142 is about 4661.9890604762. The cubic root of 21734142 is about 279.0706518057.

Adding to 21734142 its reverse (24143712), we get a palindrome (45877854).

The spelling of 21734142 in words is "twenty-one million, seven hundred thirty-four thousand, one hundred forty-two".