21612223050 has 96 divisors (see below), whose sum is σ = 59272188480. Its totient is φ = 5167526400.

The previous prime is 21612223049. The next prime is 21612223099. The reversal of 21612223050 is 5032221612.

It is a self number, because there is not a number n which added to its sum of digits gives 21612223050.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30736 + ... + 210164.

It is an arithmetic number, because the mean of its divisors is an integer number (617418630).

Almost surely, 2^21612223050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21612223050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29636094240).

21612223050 is an abundant number, since it is smaller than the sum of its proper divisors (37659965430).

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

21612223050 is a wasteful number, since it uses less digits than its factorization.

21612223050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179528 (or 179523 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21612223050 its reverse (5032221612), we get a palindrome (26644444662).

The spelling of 21612223050 in words is "twenty-one billion, six hundred twelve million, two hundred twenty-three thousand, fifty".