21476220 has 48 divisors (see below), whose sum is σ = 60510240. Its totient is φ = 5691136.

The previous prime is 21476207. The next prime is 21476261. The reversal of 21476220 is 2267412.

It is a super-2 number, since 2×21476220² = 922456050976800, 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 15 ways as a sum of consecutive naturals, for example, 9346 + ... + 11414.

It is an arithmetic number, because the mean of its divisors is an integer number (1260630).

Almost surely, 2^21476220 is an apocalyptic number.

21476220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21476220 is an abundant number, since it is smaller than the sum of its proper divisors (39034020).

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

21476220 is a wasteful number, since it uses less digits than its factorization.

21476220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254 (or 2252 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21476220 is about 4634.2442749601. The cubic root of 21476220 is about 277.9623329398.

The spelling of 21476220 in words is "twenty-one million, four hundred seventy-six thousand, two hundred twenty".