2221100110021 has 4 divisors (see below), whose sum is σ = 2391953964652. Its totient is φ = 2050246255392.

The previous prime is 2221100110007. The next prime is 2221100110039. The reversal of 2221100110021 is 1200110011222.

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 219126972100 + 2001973137921 = 468110^2 + 1414911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221100110021 - 2¹¹ = 2221100107973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 170853854617 = 2221100110021 / (2 + 2 + 2 + 1 + 1 + 0 + 0 + 1 + 1 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221100109983 and 2221100110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221100110051) 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, 85426927296 + ... + 85426927321.

It is an arithmetic number, because the mean of its divisors is an integer number (597988491163).

Almost surely, 2^{2221100110021} is an apocalyptic number.

It is an amenable number.

2221100110021 is a deficient number, since it is larger than the sum of its proper divisors (170853854631).

2221100110021 is a wasteful number, since it uses less digits than its factorization.

2221100110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170853854630.

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

Adding to 2221100110021 its reverse (1200110011222), we get a palindrome (3421210121243).

The spelling of 2221100110021 in words is "two trillion, two hundred twenty-one billion, one hundred million, one hundred ten thousand, twenty-one".