21935481 has 24 divisors (see below), whose sum is σ = 31607520. Its totient is φ = 13493376.

The previous prime is 21935479. The next prime is 21935509. The reversal of 21935481 is 18453912.

It is not a de Polignac number, because 21935481 - 2¹ = 21935479 is a prime.

It is a super-2 number, since 2×21935481² = 962330653402722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21935411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160045 + ... + 160181.

It is an arithmetic number, because the mean of its divisors is an integer number (1316980).

Almost surely, 2^21935481 is an apocalyptic number.

It is an amenable number.

21935481 is a deficient number, since it is larger than the sum of its proper divisors (9672039).

21935481 is a wasteful number, since it uses less digits than its factorization.

21935481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 212 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 21935481 is about 4683.5329613445. The cubic root of 21935481 is about 279.9297485320.

The spelling of 21935481 in words is "twenty-one million, nine hundred thirty-five thousand, four hundred eighty-one".