21480052 has 48 divisors (see below), whose sum is σ = 42747264. Its totient is φ = 9360000.

The previous prime is 21480049. The next prime is 21480059. The reversal of 21480052 is 25008412.

It is a super-2 number, since 2×21480052² = 922785267845408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142177 + ... + 142327.

It is an arithmetic number, because the mean of its divisors is an integer number (890568).

Almost surely, 2^21480052 is an apocalyptic number.

21480052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21480052 is a deficient number, since it is larger than the sum of its proper divisors (21267212).

21480052 is a wasteful number, since it uses less digits than its factorization.

21480052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21480052 is about 4634.6577004133. The cubic root of 21480052 is about 277.9788642213.

Adding to 21480052 its reverse (25008412), we get a palindrome (46488464).

The spelling of 21480052 in words is "twenty-one million, four hundred eighty thousand, fifty-two".