21969112 has 32 divisors (see below), whose sum is σ = 46040400. Its totient is φ = 9740800.

The previous prime is 21969107. The next prime is 21969113. The reversal of 21969112 is 21196912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21969113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564 + ... + 6652.

Almost surely, 2^21969112 is an apocalyptic number.

21969112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21969112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23020200).

21969112 is an abundant number, since it is smaller than the sum of its proper divisors (24071288).

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

21969112 is a wasteful number, since it uses less digits than its factorization.

21969112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6147 (or 6143 counting only the distinct ones).

The product of its digits is 1944, while the sum is 31.

The square root of 21969112 is about 4687.1219314202. The cubic root of 21969112 is about 280.0727362056.

The spelling of 21969112 in words is "twenty-one million, nine hundred sixty-nine thousand, one hundred twelve".