21472258 has 8 divisors (see below), whose sum is σ = 34103052. Its totient is φ = 10104576.

The previous prime is 21472249. The next prime is 21472259. The reversal of 21472258 is 85227412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21464689 + 7569 = 4633^2 + 87^2 .

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

It is a super-2 number, since 2×21472258² = 922115727237128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315735 + ... + 315802.

Almost surely, 2^21472258 is an apocalyptic number.

21472258 is a deficient number, since it is larger than the sum of its proper divisors (12630794).

21472258 is a wasteful number, since it uses less digits than its factorization.

21472258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631556.

The product of its digits is 8960, while the sum is 31.

The square root of 21472258 is about 4633.8167853293. The cubic root of 21472258 is about 277.9452387694.

The spelling of 21472258 in words is "twenty-one million, four hundred seventy-two thousand, two hundred fifty-eight".