2221212222021 has 8 divisors (see below), whose sum is σ = 3189432934240. Its totient is φ = 1366899828912.

The previous prime is 2221212222001. The next prime is 2221212222049. The reversal of 2221212222021 is 1202222121222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2221212222021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221212222001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28477079731 + ... + 28477079808.

It is an arithmetic number, because the mean of its divisors is an integer number (398679116780).

Almost surely, 2^{2221212222021} is an apocalyptic number.

It is an amenable number.

2221212222021 is a deficient number, since it is larger than the sum of its proper divisors (968220712219).

2221212222021 is a wasteful number, since it uses less digits than its factorization.

2221212222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56954159555.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 2221212222021 its reverse (1202222121222), we get a palindrome (3423434343243).

The spelling of 2221212222021 in words is "two trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, twenty-one".