21457882 has 8 divisors (see below), whose sum is σ = 32373396. Its totient is φ = 10666752.

The previous prime is 21457871. The next prime is 21457939. The reversal of 21457882 is 28875412.

It can be written as a sum of positive squares in 2 ways, for example, as 14280841 + 7177041 = 3779^2 + 2679^2 .

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

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, 30663 + ... + 31354.

Almost surely, 2^21457882 is an apocalyptic number.

21457882 is a deficient number, since it is larger than the sum of its proper divisors (10915514).

21457882 is a wasteful number, since it uses less digits than its factorization.

21457882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62192.

The product of its digits is 35840, while the sum is 37.

The square root of 21457882 is about 4632.2653205532. The cubic root of 21457882 is about 277.8831954138.

The spelling of 21457882 in words is "twenty-one million, four hundred fifty-seven thousand, eight hundred eighty-two".