21547422222220 has 24 divisors (see below), whose sum is σ = 45275879351808. Its totient is φ = 8613960758400.

The previous prime is 21547422222203. The next prime is 21547422222239. The reversal of 21547422222220 is 2222222474512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21547422222220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312972876 + ... + 313041715.

It is an arithmetic number, because the mean of its divisors is an integer number (1886494972992).

Almost surely, 2^{21547422222220} is an apocalyptic number.

21547422222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21547422222220 is an abundant number, since it is smaller than the sum of its proper divisors (23728457129588).

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

21547422222220 is a wasteful number, since it uses less digits than its factorization.

21547422222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626016321 (or 626016319 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 37.

Adding to 21547422222220 its reverse (2222222474512), we get a palindrome (23769644696732).

The spelling of 21547422222220 in words is "twenty-one trillion, five hundred forty-seven billion, four hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty".