21471260 has 12 divisors (see below), whose sum is σ = 45089688. Its totient is φ = 8588496.

The previous prime is 21471257. The next prime is 21471283. The reversal of 21471260 is 6217412.

It is a super-2 number, since 2×21471260² = 922030011975200, 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 3 ways as a sum of consecutive naturals, for example, 536762 + ... + 536801.

It is an arithmetic number, because the mean of its divisors is an integer number (3757474).

Almost surely, 2^21471260 is an apocalyptic number.

21471260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21471260 is an abundant number, since it is smaller than the sum of its proper divisors (23618428).

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

21471260 is a wasteful number, since it uses less digits than its factorization.

21471260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073572 (or 1073570 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21471260 is about 4633.7090974726. The cubic root of 21471260 is about 277.9409325363.

Adding to 21471260 its reverse (6217412), we get a palindrome (27688672).

The spelling of 21471260 in words is "twenty-one million, four hundred seventy-one thousand, two hundred sixty".