2221121001 has 16 divisors (see below), whose sum is σ = 3243018240. Its totient is φ = 1341010320.

The previous prime is 2221120999. The next prime is 2221121051. The reversal of 2221121001 is 1001211222.

2221121001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2221121001 - 2¹ = 2221120999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2221121051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119281 + ... + 136638.

It is an arithmetic number, because the mean of its divisors is an integer number (202688640).

Almost surely, 2^2221121001 is an apocalyptic number.

It is an amenable number.

2221121001 is a deficient number, since it is larger than the sum of its proper divisors (1021897239).

2221121001 is a wasteful number, since it uses less digits than its factorization.

2221121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256196.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2221121001 is about 47128.7704168059. The cubic root of 2221121001 is about 1304.7402880070.

Adding to 2221121001 its reverse (1001211222), we get a palindrome (3222332223).

The spelling of 2221121001 in words is "two billion, two hundred twenty-one million, one hundred twenty-one thousand, one".