21480746 has 16 divisors (see below), whose sum is σ = 36898944. Its totient is φ = 9187344.

The previous prime is 21480733. The next prime is 21480749. The reversal of 21480746 is 64708412.

It is a super-2 number, since 2×21480746² = 922844897433032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21480749) 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, 7331 + ... + 9833.

It is an arithmetic number, because the mean of its divisors is an integer number (2306184).

Almost surely, 2^21480746 is an apocalyptic number.

21480746 is a deficient number, since it is larger than the sum of its proper divisors (15418198).

21480746 is a wasteful number, since it uses less digits than its factorization.

21480746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21480746 is about 4634.7325704942. The cubic root of 21480746 is about 277.9818579331.

The spelling of 21480746 in words is "twenty-one million, four hundred eighty thousand, seven hundred forty-six".