21887342 has 4 divisors (see below), whose sum is σ = 32831016. Its totient is φ = 10943670.

The previous prime is 21887339. The next prime is 21887351. The reversal of 21887342 is 24378812.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5471834 + ... + 5471837.

It is an arithmetic number, because the mean of its divisors is an integer number (8207754).

Almost surely, 2^21887342 is an apocalyptic number.

21887342 is a deficient number, since it is larger than the sum of its proper divisors (10943674).

21887342 is a wasteful number, since it uses less digits than its factorization.

21887342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10943673.

The product of its digits is 21504, while the sum is 35.

The square root of 21887342 is about 4678.3909627136. The cubic root of 21887342 is about 279.7248231893.

The spelling of 21887342 in words is "twenty-one million, eight hundred eighty-seven thousand, three hundred forty-two".