21474805 has 24 divisors (see below), whose sum is σ = 28859040. Its totient is φ = 15213120.

The previous prime is 21474799. The next prime is 21474821. The reversal of 21474805 is 50847412.

21474805 = T₈₉ + T₉₀ + ... + T₅₀₅.

It is not a de Polignac number, because 21474805 - 2³ = 21474797 is a prime.

It is a super-2 number, since 2×21474805² = 922334499576050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154426 + ... + 154564.

It is an arithmetic number, because the mean of its divisors is an integer number (1202460).

Almost surely, 2^21474805 is an apocalyptic number.

It is an amenable number.

21474805 is a deficient number, since it is larger than the sum of its proper divisors (7384235).

21474805 is a wasteful number, since it uses less digits than its factorization.

21474805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 208 counting only the distinct ones).

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

The square root of 21474805 is about 4634.0916046190. The cubic root of 21474805 is about 277.9562281203.

The spelling of 21474805 in words is "twenty-one million, four hundred seventy-four thousand, eight hundred five".