21472858 has 8 divisors (see below), whose sum is σ = 35137440. Its totient is φ = 9760380.

The previous prime is 21472849. The next prime is 21472879. The reversal of 21472858 is 85827412.

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

It is a super-2 number, since 2×21472858² = 922167261376328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487998 + ... + 488041.

It is an arithmetic number, because the mean of its divisors is an integer number (4392180).

Almost surely, 2^21472858 is an apocalyptic number.

21472858 is a deficient number, since it is larger than the sum of its proper divisors (13664582).

21472858 is a wasteful number, since it uses less digits than its factorization.

21472858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976052.

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

The square root of 21472858 is about 4633.8815263233. The cubic root of 21472858 is about 277.9478276229.

It can be divided in two parts, 2147 and 2858, that added together give a palindrome (5005).

The spelling of 21472858 in words is "twenty-one million, four hundred seventy-two thousand, eight hundred fifty-eight".