21487862 has 8 divisors (see below), whose sum is σ = 35161992. Its totient is φ = 9767200.

The previous prime is 21487783. The next prime is 21487891. The reversal of 21487862 is 26878412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488339 + ... + 488382.

It is an arithmetic number, because the mean of its divisors is an integer number (4395249).

Almost surely, 2^21487862 is an apocalyptic number.

21487862 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21487862 is a deficient number, since it is larger than the sum of its proper divisors (13674130).

21487862 is a wasteful number, since it uses less digits than its factorization.

21487862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976734.

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

The square root of 21487862 is about 4635.5001887606. The cubic root of 21487862 is about 278.0125505436.

The spelling of 21487862 in words is "twenty-one million, four hundred eighty-seven thousand, eight hundred sixty-two".