21004862 has 8 divisors (see below), whose sum is σ = 32023992. Its totient is φ = 10330200.

The previous prime is 21004847. The next prime is 21004883. The reversal of 21004862 is 26840012.

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, 85964 + ... + 86207.

It is an arithmetic number, because the mean of its divisors is an integer number (4002999).

Almost surely, 2^21004862 is an apocalyptic number.

21004862 is a deficient number, since it is larger than the sum of its proper divisors (11019130).

21004862 is a wasteful number, since it uses less digits than its factorization.

21004862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172234.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21004862 is about 4583.1061519454. The cubic root of 21004862 is about 275.9137078830.

Adding to 21004862 its reverse (26840012), we get a palindrome (47844874).

The spelling of 21004862 in words is "twenty-one million, four thousand, eight hundred sixty-two".