21071460 has 48 divisors (see below), whose sum is σ = 59234112. Its totient is φ = 5596800.

The previous prime is 21071447. The next prime is 21071461. The reversal of 21071460 is 6417012.

It is a super-4 number, since 4×21071460⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21071461) 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, 19330 + ... + 20390.

It is an arithmetic number, because the mean of its divisors is an integer number (1234044).

Almost surely, 2^21071460 is an apocalyptic number.

21071460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21071460 is an abundant number, since it is smaller than the sum of its proper divisors (38162652).

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

21071460 is a wasteful number, since it uses less digits than its factorization.

21071460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404 (or 1402 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21071460 is about 4590.3659984799. The cubic root of 21071460 is about 276.2050041713.

Adding to 21071460 its reverse (6417012), we get a palindrome (27488472).

The spelling of 21071460 in words is "twenty-one million, seventy-one thousand, four hundred sixty".