21474415 has 8 divisors (see below), whose sum is σ = 26368848. Its totient is φ = 16779840.

The previous prime is 21474391. The next prime is 21474421. The reversal of 21474415 is 51447412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21474415 is a prime.

It is a super-2 number, since 2×21474415² = 922300999184450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49726 + ... + 50155.

It is an arithmetic number, because the mean of its divisors is an integer number (3296106).

Almost surely, 2^21474415 is an apocalyptic number.

21474415 is a deficient number, since it is larger than the sum of its proper divisors (4894433).

21474415 is an equidigital number, since it uses as much as digits as its factorization.

21474415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99929.

The product of its digits is 4480, while the sum is 28.

The square root of 21474415 is about 4634.0495249835. The cubic root of 21474415 is about 277.9545454728.

The spelling of 21474415 in words is "twenty-one million, four hundred seventy-four thousand, four hundred fifteen".