21223050 has 48 divisors (see below), whose sum is σ = 53038272. Its totient is φ = 5616000.

The previous prime is 21223009. The next prime is 21223051. The reversal of 21223050 is 5032212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21223051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22182 + ... + 23118.

It is an arithmetic number, because the mean of its divisors is an integer number (1104964).

Almost surely, 2^21223050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21223050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26519136).

21223050 is an abundant number, since it is smaller than the sum of its proper divisors (31815222).

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

21223050 is a wasteful number, since it uses less digits than its factorization.

21223050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 21223050 is about 4606.8481633325. The cubic root of 21223050 is about 276.8657701336.

Adding to 21223050 its reverse (5032212), we get a palindrome (26255262).

The spelling of 21223050 in words is "twenty-one million, two hundred twenty-three thousand, fifty".