222121021020 has 96 divisors (see below), whose sum is σ = 636539904000. Its totient is φ = 57842292480.

The previous prime is 222121021019. The next prime is 222121021079. The reversal of 222121021020 is 20120121222.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22779106 + ... + 22788854.

It is an arithmetic number, because the mean of its divisors is an integer number (6630624000).

Almost surely, 2^222121021020 is an apocalyptic number.

222121021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222121021020 is an abundant number, since it is smaller than the sum of its proper divisors (414418882980).

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

222121021020 is a wasteful number, since it uses less digits than its factorization.

222121021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18635 (or 18633 counting only the distinct ones).

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

Adding to 222121021020 its reverse (20120121222), we get a palindrome (242241142242).

The spelling of 222121021020 in words is "two hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, twenty".