21872486 has 4 divisors (see below), whose sum is σ = 32808732. Its totient is φ = 10936242.

The previous prime is 21872483. The next prime is 21872503. The reversal of 21872486 is 68427812.

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 (21872483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5468120 + ... + 5468123.

It is an arithmetic number, because the mean of its divisors is an integer number (8202183).

Almost surely, 2^21872486 is an apocalyptic number.

21872486 is a deficient number, since it is larger than the sum of its proper divisors (10936246).

21872486 is a wasteful number, since it uses less digits than its factorization.

21872486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10936245.

The product of its digits is 43008, while the sum is 38.

The square root of 21872486 is about 4676.8029678403. The cubic root of 21872486 is about 279.6615212661.

The spelling of 21872486 in words is "twenty-one million, eight hundred seventy-two thousand, four hundred eighty-six".