21869952 has 96 divisors (see below), whose sum is σ = 63091080. Its totient is φ = 6709248.

The previous prime is 21869951. The next prime is 21869959. The reversal of 21869952 is 25996812.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869951) 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 11 ways as a sum of consecutive naturals, for example, 64728 + ... + 65064.

Almost surely, 2^21869952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21869952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31545540).

21869952 is an abundant number, since it is smaller than the sum of its proper divisors (41221128).

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

21869952 is a wasteful number, since it uses less digits than its factorization.

21869952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 355 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 21869952 is about 4676.5320484308. The cubic root of 21869952 is about 279.6507209443.

The spelling of 21869952 in words is "twenty-one million, eight hundred sixty-nine thousand, nine hundred fifty-two".