21254312 has 16 divisors (see below), whose sum is σ = 41949600. Its totient is φ = 10067760.

The previous prime is 21254309. The next prime is 21254327. The reversal of 21254312 is 21345212.

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, 69764 + ... + 70067.

It is an arithmetic number, because the mean of its divisors is an integer number (2621850).

Almost surely, 2^21254312 is an apocalyptic number.

It is an amenable number.

21254312 is a deficient number, since it is larger than the sum of its proper divisors (20695288).

21254312 is a wasteful number, since it uses less digits than its factorization.

21254312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139856 (or 139852 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21254312 is about 4610.2399069897. The cubic root of 21254312 is about 277.0016464776.

Adding to 21254312 its reverse (21345212), we get a palindrome (42599524).

The spelling of 21254312 in words is "twenty-one million, two hundred fifty-four thousand, three hundred twelve".