21905468 has 48 divisors (see below), whose sum is σ = 43352064. Its totient is φ = 9616320.

The previous prime is 21905441. The next prime is 21905473. The reversal of 21905468 is 86450912.

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, 172421 + ... + 172547.

It is an arithmetic number, because the mean of its divisors is an integer number (903168).

Almost surely, 2^21905468 is an apocalyptic number.

It is an amenable number.

21905468 is a deficient number, since it is larger than the sum of its proper divisors (21446596).

21905468 is a wasteful number, since it uses less digits than its factorization.

21905468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21905468 is about 4680.3277663001. The cubic root of 21905468 is about 279.8020199108.

The spelling of 21905468 in words is "twenty-one million, nine hundred five thousand, four hundred sixty-eight".