2221120021021 has 4 divisors (see below), whose sum is σ = 2423040022944. Its totient is φ = 2019200019100.

The previous prime is 2221120021007. The next prime is 2221120021033. The reversal of 2221120021021 is 1201200211222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2221120021021 - 2¹¹ = 2221120018973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221120020986 and 2221120021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221120021121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100960000945 + ... + 100960000966.

It is an arithmetic number, because the mean of its divisors is an integer number (605760005736).

Almost surely, 2^{2221120021021} is an apocalyptic number.

It is an amenable number.

2221120021021 is a deficient number, since it is larger than the sum of its proper divisors (201920001923).

2221120021021 is a wasteful number, since it uses less digits than its factorization.

2221120021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201920001922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2221120021021 its reverse (1201200211222), we get a palindrome (3422320232243).

The spelling of 2221120021021 in words is "two trillion, two hundred twenty-one billion, one hundred twenty million, twenty-one thousand, twenty-one".