2221001332221 has 48 divisors (see below), whose sum is σ = 3668421277824. Its totient is φ = 1169850584448.

The previous prime is 2221001332217. The next prime is 2221001332223. The reversal of 2221001332221 is 1222331001222.

It is not a de Polignac number, because 2221001332221 - 2² = 2221001332217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221001332223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3678550 + ... + 4239543.

It is an arithmetic number, because the mean of its divisors is an integer number (76425443288).

Almost surely, 2^{2221001332221} is an apocalyptic number.

2221001332221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2221001332221 is a deficient number, since it is larger than the sum of its proper divisors (1447419945603).

2221001332221 is a wasteful number, since it uses less digits than its factorization.

2221001332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7918178 (or 7918159 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 2221001332221 its reverse (1222331001222), we get a palindrome (3443332333443).

The spelling of 2221001332221 in words is "two trillion, two hundred twenty-one billion, one million, three hundred thirty-two thousand, two hundred twenty-one".