21276490 has 8 divisors (see below), whose sum is σ = 38297700. Its totient is φ = 8510592.

The previous prime is 21276487. The next prime is 21276491. The reversal of 21276490 is 9467212.

It can be written as a sum of positive squares in 2 ways, for example, as 20349121 + 927369 = 4511^2 + 963^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21276491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063815 + ... + 1063834.

Almost surely, 2^21276490 is an apocalyptic number.

21276490 is a deficient number, since it is larger than the sum of its proper divisors (17021210).

21276490 is a wasteful number, since it uses less digits than its factorization.

21276490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127656.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21276490 is about 4612.6445776799. The cubic root of 21276490 is about 277.0979595925.

The spelling of 21276490 in words is "twenty-one million, two hundred seventy-six thousand, four hundred ninety".