21254806 has 32 divisors (see below), whose sum is σ = 35562240. Its totient is φ = 9481824.

The previous prime is 21254797. The next prime is 21254813. The reversal of 21254806 is 60845212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72396 + ... + 72688.

It is an arithmetic number, because the mean of its divisors is an integer number (1111320).

Almost surely, 2^21254806 is an apocalyptic number.

21254806 is a deficient number, since it is larger than the sum of its proper divisors (14307434).

21254806 is a wasteful number, since it uses less digits than its factorization.

21254806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21254806 is about 4610.2934830659. The cubic root of 21254806 is about 277.0037925167.

The spelling of 21254806 in words is "twenty-one million, two hundred fifty-four thousand, eight hundred six".