2111000221021 has 4 divisors (see below), whose sum is σ = 2111128698492. Its totient is φ = 2110871743552.

The previous prime is 2111000221019. The next prime is 2111000221027. The reversal of 2111000221021 is 1201220001112.

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 2023435125625 + 87565095396 = 1422475^2 + 295914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111000221021 - 2¹ = 2111000221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111000220992 and 2111000221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111000221027) 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, 64214086 + ... + 64246951.

It is an arithmetic number, because the mean of its divisors is an integer number (527782174623).

Almost surely, 2^{2111000221021} is an apocalyptic number.

It is an amenable number.

2111000221021 is a deficient number, since it is larger than the sum of its proper divisors (128477471).

2111000221021 is a wasteful number, since it uses less digits than its factorization.

2111000221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128477470.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2111000221021 its reverse (1201220001112), we get a palindrome (3312220222133).

The spelling of 2111000221021 in words is "two trillion, one hundred eleven billion, two hundred twenty-one thousand, twenty-one".