21474099 has 8 divisors (see below), whose sum is σ = 31813520. Its totient is φ = 14316048.

The previous prime is 21474091. The next prime is 21474113. The reversal of 21474099 is 99047412.

It is not a de Polignac number, because 21474099 - 2³ = 21474091 is a prime.

It is a super-2 number, since 2×21474099² = 922273855723602, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21474091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397642 + ... + 397695.

It is an arithmetic number, because the mean of its divisors is an integer number (3976690).

Almost surely, 2^21474099 is an apocalyptic number.

21474099 is a deficient number, since it is larger than the sum of its proper divisors (10339421).

21474099 is an equidigital number, since it uses as much as digits as its factorization.

21474099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795346 (or 795340 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21474099 is about 4634.0154294089. The cubic root of 21474099 is about 277.9531820819.

The spelling of 21474099 in words is "twenty-one million, four hundred seventy-four thousand, ninety-nine".