2111221001 has 4 divisors (see below), whose sum is σ = 2111344404. Its totient is φ = 2111097600.

The previous prime is 2111220977. The next prime is 2111221003. The reversal of 2111221001 is 1001221112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1640331001 + 470890000 = 40501^2 + 21700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111221001 - 2¹⁴ = 2111204617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111221003) 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, 30920 + ... + 71961.

It is an arithmetic number, because the mean of its divisors is an integer number (527836101).

Almost surely, 2^2111221001 is an apocalyptic number.

It is an amenable number.

2111221001 is a deficient number, since it is larger than the sum of its proper divisors (123403).

2111221001 is a wasteful number, since it uses less digits than its factorization.

2111221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123402.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2111221001 is about 45948.0249956405. The cubic root of 2111221001 is about 1282.8559685321.

Adding to 2111221001 its reverse (1001221112), we get a palindrome (3112442113).

The spelling of 2111221001 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, one".