21829342 has 4 divisors (see below), whose sum is σ = 32744016. Its totient is φ = 10914670.

The previous prime is 21829333. The next prime is 21829349. The reversal of 21829342 is 24392812.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21829349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5457334 + ... + 5457337.

It is an arithmetic number, because the mean of its divisors is an integer number (8186004).

Almost surely, 2^21829342 is an apocalyptic number.

21829342 is a deficient number, since it is larger than the sum of its proper divisors (10914674).

21829342 is a wasteful number, since it uses less digits than its factorization.

21829342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10914673.

The product of its digits is 6912, while the sum is 31.

The square root of 21829342 is about 4672.1881383352. The cubic root of 21829342 is about 279.4775205588.

The spelling of 21829342 in words is "twenty-one million, eight hundred twenty-nine thousand, three hundred forty-two".