21476648 has 16 divisors (see below), whose sum is σ = 40836960. Its totient is φ = 10586800.

The previous prime is 21476647. The next prime is 21476657. The reversal of 21476648 is 84667412.

It is a super-2 number, since 2×21476648² = 922492818631808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21476647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18338 + ... + 19473.

It is an arithmetic number, because the mean of its divisors is an integer number (2552310).

Almost surely, 2^21476648 is an apocalyptic number.

It is an amenable number.

21476648 is a deficient number, since it is larger than the sum of its proper divisors (19360312).

21476648 is a wasteful number, since it uses less digits than its factorization.

21476648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37888 (or 37884 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 21476648 is about 4634.2904527015. The cubic root of 21476648 is about 277.9641794331.

The spelling of 21476648 in words is "twenty-one million, four hundred seventy-six thousand, six hundred forty-eight".