22121505 has 96 divisors (see below), whose sum is σ = 48334080. Its totient is φ = 9517824.

The previous prime is 22121503. The next prime is 22121513. The reversal of 22121505 is 50512122.

It is not a de Polignac number, because 22121505 - 2¹ = 22121503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22121503) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1301257 + ... + 1301273.

It is an arithmetic number, because the mean of its divisors is an integer number (503480).

Almost surely, 2^22121505 is an apocalyptic number.

It is an amenable number.

22121505 is an abundant number, since it is smaller than the sum of its proper divisors (26212575).

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

22121505 is an frugal number, since it uses more digits than its factorization.

22121505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 32 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 22121505 is about 4703.3504015755. The cubic root of 22121505 is about 280.7188374898.

Adding to 22121505 its reverse (50512122), we get a palindrome (72633627).

The spelling of 22121505 in words is "twenty-two million, one hundred twenty-one thousand, five hundred five".