21214486 has 16 divisors (see below), whose sum is σ = 33030000. Its totient is φ = 10207008.

The previous prime is 21214477. The next prime is 21214493. The reversal of 21214486 is 68441212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28576 + ... + 29308.

It is an arithmetic number, because the mean of its divisors is an integer number (2064375).

Almost surely, 2^21214486 is an apocalyptic number.

21214486 is a deficient number, since it is larger than the sum of its proper divisors (11815514).

21214486 is a wasteful number, since it uses less digits than its factorization.

21214486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263.

The product of its digits is 3072, while the sum is 28.

The square root of 21214486 is about 4605.9185837355. The cubic root of 21214486 is about 276.8285245059.

Adding to 21214486 its reverse (68441212), we get a palindrome (89655698).

The spelling of 21214486 in words is "twenty-one million, two hundred fourteen thousand, four hundred eighty-six".