21475246 has 8 divisors (see below), whose sum is σ = 34690824. Its totient is φ = 9911640.

The previous prime is 21475241. The next prime is 21475247. The reversal of 21475246 is 64257412.

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

It is a super-2 number, since 2×21475246² = 922372381521032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475241) 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, 412960 + ... + 413011.

It is an arithmetic number, because the mean of its divisors is an integer number (4336353).

Almost surely, 2^21475246 is an apocalyptic number.

21475246 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21475246 is a deficient number, since it is larger than the sum of its proper divisors (13215578).

21475246 is a wasteful number, since it uses less digits than its factorization.

21475246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825986.

The product of its digits is 13440, while the sum is 31.

The square root of 21475246 is about 4634.1391865157. The cubic root of 21475246 is about 277.9581307819.

The spelling of 21475246 in words is "twenty-one million, four hundred seventy-five thousand, two hundred forty-six".