21906262 has 16 divisors (see below), whose sum is σ = 37716480. Its totient is φ = 9347688.

The previous prime is 21906233. The next prime is 21906263. The reversal of 21906262 is 26260912.

It is a self number, because there is not a number n which added to its sum of digits gives 21906262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21906263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73 + ... + 6619.

It is an arithmetic number, because the mean of its divisors is an integer number (2357280).

Almost surely, 2^21906262 is an apocalyptic number.

21906262 is a deficient number, since it is larger than the sum of its proper divisors (15810218).

21906262 is a wasteful number, since it uses less digits than its factorization.

21906262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21906262 is about 4680.4125886507. The cubic root of 21906262 is about 279.8054004993.

The spelling of 21906262 in words is "twenty-one million, nine hundred six thousand, two hundred sixty-two".