2102211001001 has 4 divisors (see below), whose sum is σ = 2120814638292. Its totient is φ = 2083607363712.

The previous prime is 2102211000991. The next prime is 2102211001019. The reversal of 2102211001001 is 1001001122012.

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 577677522601 + 1524533478400 = 760051^2 + 1234720^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102211001001 - 2¹⁸ = 2102210738857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102211006001) 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, 9301818476 + ... + 9301818701.

It is an arithmetic number, because the mean of its divisors is an integer number (530203659573).

Almost surely, 2^{2102211001001} is an apocalyptic number.

It is an amenable number.

2102211001001 is a deficient number, since it is larger than the sum of its proper divisors (18603637291).

2102211001001 is a wasteful number, since it uses less digits than its factorization.

2102211001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18603637290.

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

Adding to 2102211001001 its reverse (1001001122012), we get a palindrome (3103212123013).

The spelling of 2102211001001 in words is "two trillion, one hundred two billion, two hundred eleven million, one thousand, one".