21022350 has 48 divisors (see below), whose sum is σ = 52429680. Its totient is φ = 5574400.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022350 is 5322012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022357) 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, 40090 + ... + 40610.

It is an arithmetic number, because the mean of its divisors is an integer number (1092285).

Almost surely, 2^21022350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26214840).

21022350 is an abundant number, since it is smaller than the sum of its proper divisors (31407330).

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

21022350 is a wasteful number, since it uses less digits than its factorization.

21022350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 800 counting only the distinct ones).

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

The square root of 21022350 is about 4585.0136313865. The cubic root of 21022350 is about 275.9902590555.

Adding to 21022350 its reverse (5322012), we get a palindrome (26344362).

The spelling of 21022350 in words is "twenty-one million, twenty-two thousand, three hundred fifty".