22121445450 has 192 divisors, whose sum is σ = 60805108224. Its totient is φ = 5287680000.

The previous prime is 22121445431. The next prime is 22121445481. The reversal of 22121445450 is 5454412122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21665940 + ... + 21666960.

It is an arithmetic number, because the mean of its divisors is an integer number (316693272).

Almost surely, 2^22121445450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22121445450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30402554112).

22121445450 is an abundant number, since it is smaller than the sum of its proper divisors (38683662774).

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

22121445450 is a wasteful number, since it uses less digits than its factorization.

22121445450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 22121445450 its reverse (5454412122), we get a palindrome (27575857572).

The spelling of 22121445450 in words is "twenty-two billion, one hundred twenty-one million, four hundred forty-five thousand, four hundred fifty".