21869152 has 24 divisors (see below), whose sum is σ = 45322200. Its totient is φ = 10358784.

The previous prime is 21869149. The next prime is 21869153. The reversal of 21869152 is 25196812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869153) 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 3 ways as a sum of consecutive naturals, for example, 17377 + ... + 18592.

It is an arithmetic number, because the mean of its divisors is an integer number (1888425).

Almost surely, 2^21869152 is an apocalyptic number.

It is an amenable number.

21869152 is an abundant number, since it is smaller than the sum of its proper divisors (23453048).

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

21869152 is a wasteful number, since it uses less digits than its factorization.

21869152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35998 (or 35990 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 21869152 is about 4676.4465141815. The cubic root of 21869152 is about 279.6473110403.

The spelling of 21869152 in words is "twenty-one million, eight hundred sixty-nine thousand, one hundred fifty-two".