20122121220 has 96 divisors (see below), whose sum is σ = 56742819840. Its totient is φ = 5327831040.

The previous prime is 20122121207. The next prime is 20122121293. The reversal of 20122121220 is 2212122102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20122121220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7711276 + ... + 7713884.

It is an arithmetic number, because the mean of its divisors is an integer number (591071040).

Almost surely, 2^20122121220 is an apocalyptic number.

20122121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20122121220 is an abundant number, since it is smaller than the sum of its proper divisors (36620698620).

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

20122121220 is a wasteful number, since it uses less digits than its factorization.

20122121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485 (or 3483 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20122121220 its reverse (2212122102), we get a palindrome (22334243322).

The spelling of 20122121220 in words is "twenty billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".