21369876 has 48 divisors (see below), whose sum is σ = 54989760. Its totient is φ = 6405120.

The previous prime is 21369871. The next prime is 21369893. The reversal of 21369876 is 67896312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11970 + ... + 13638.

It is an arithmetic number, because the mean of its divisors is an integer number (1145620).

Almost surely, 2^21369876 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 21369876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27494880).

21369876 is an abundant number, since it is smaller than the sum of its proper divisors (33619884).

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

21369876 is a wasteful number, since it uses less digits than its factorization.

21369876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784 (or 1782 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 21369876 is about 4622.7563206382. The cubic root of 21369876 is about 277.5027773442.

The spelling of 21369876 in words is "twenty-one million, three hundred sixty-nine thousand, eight hundred seventy-six".