2221121101020 has 96 divisors (see below), whose sum is σ = 6547856071680. Its totient is φ = 561005856000.

The previous prime is 2221121101013. The next prime is 2221121101061. The reversal of 2221121101020 is 201011211222.

It is a super-3 number, since 3×2221121101020³ (a number of 38 digits) contains 333 as substring.

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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5211094 + ... + 5621186.

It is an arithmetic number, because the mean of its divisors is an integer number (68206834080).

Almost surely, 2^{2221121101020} is an apocalyptic number.

2221121101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221121101020 is an abundant number, since it is smaller than the sum of its proper divisors (4326734970660).

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

2221121101020 is a wasteful number, since it uses less digits than its factorization.

2221121101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414875 (or 414873 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2221121101020 its reverse (201011211222), we get a palindrome (2422132312242).

The spelling of 2221121101020 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, twenty".