21852478 has 4 divisors (see below), whose sum is σ = 32778720. Its totient is φ = 10926238.

The previous prime is 21852473. The next prime is 21852511. The reversal of 21852478 is 87425812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5463118 + ... + 5463121.

It is an arithmetic number, because the mean of its divisors is an integer number (8194680).

Almost surely, 2^21852478 is an apocalyptic number.

21852478 is a deficient number, since it is larger than the sum of its proper divisors (10926242).

21852478 is a wasteful number, since it uses less digits than its factorization.

21852478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10926241.

The product of its digits is 35840, while the sum is 37.

The square root of 21852478 is about 4674.6634103430. The cubic root of 21852478 is about 279.5762211810.

The spelling of 21852478 in words is "twenty-one million, eight hundred fifty-two thousand, four hundred seventy-eight".