21472516 has 24 divisors (see below), whose sum is σ = 40987520. Its totient is φ = 9783072.

The previous prime is 21472483. The next prime is 21472531. The reversal of 21472516 is 61527412.

It is a super-2 number, since 2×21472516² = 922137886740512, which contains 22 as substring.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495 + ... + 6721.

Almost surely, 2^21472516 is an apocalyptic number.

21472516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21472516 is a deficient number, since it is larger than the sum of its proper divisors (19515004).

21472516 is a wasteful number, since it uses less digits than its factorization.

21472516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323 (or 5321 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 21472516 is about 4633.8446240676. The cubic root of 21472516 is about 277.9463519823.

Adding to 21472516 its reverse (61527412), we get a palindrome (82999928).

The spelling of 21472516 in words is "twenty-one million, four hundred seventy-two thousand, five hundred sixteen".