21935116 has 24 divisors (see below), whose sum is σ = 44142336. Its totient is φ = 9342480.

The previous prime is 21935071. The next prime is 21935119. The reversal of 21935116 is 61153912.

It is a super-2 number, since 2×21935116² = 962298627866912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (21935119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2331 + ... + 7021.

It is an arithmetic number, because the mean of its divisors is an integer number (1839264).

Almost surely, 2^21935116 is an apocalyptic number.

It is an amenable number.

21935116 is an abundant number, since it is smaller than the sum of its proper divisors (22207220).

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

21935116 is a wasteful number, since it uses less digits than its factorization.

21935116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869 (or 4867 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 21935116 is about 4683.4939948718. The cubic root of 21935116 is about 279.9281958736.

Subtracting 21935116 from its reverse (61153912), we obtain a triangular number (39218796 = T₈₈₅₆).

The spelling of 21935116 in words is "twenty-one million, nine hundred thirty-five thousand, one hundred sixteen".