21254316 has 12 divisors (see below), whose sum is σ = 49593432. Its totient is φ = 7084768.

The previous prime is 21254309. The next prime is 21254327. The reversal of 21254316 is 61345212.

It is a tau number, because it is divible by the number of its divisors (12).

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, 885585 + ... + 885608.

It is an arithmetic number, because the mean of its divisors is an integer number (4132786).

Almost surely, 2^21254316 is an apocalyptic number.

It is an amenable number.

21254316 is an abundant number, since it is smaller than the sum of its proper divisors (28339116).

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

21254316 is a wasteful number, since it uses less digits than its factorization.

21254316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771200 (or 1771198 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21254316 is about 4610.2403408065. The cubic root of 21254316 is about 277.0016638546.

Adding to 21254316 its reverse (61345212), we get a palindrome (82599528).

It can be divided in two parts, 2125 and 4316, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 21254316 in words is "twenty-one million, two hundred fifty-four thousand, three hundred sixteen".