21471708 has 12 divisors (see below), whose sum is σ = 50100680. Its totient is φ = 7157232.

The previous prime is 21471707. The next prime is 21471713. The reversal of 21471708 is 80717412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21471708² = 922068488874528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894643 + ... + 894666.

Almost surely, 2^21471708 is an apocalyptic number.

It is an amenable number.

21471708 is an abundant number, since it is smaller than the sum of its proper divisors (28628972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21471708 is a wasteful number, since it uses less digits than its factorization.

21471708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789316 (or 1789314 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 21471708 is about 4633.7574386236. The cubic root of 21471708 is about 277.9428656114.

The spelling of 21471708 in words is "twenty-one million, four hundred seventy-one thousand, seven hundred eight".