2211110210021 has 4 divisors (see below), whose sum is σ = 2247357918444. Its totient is φ = 2174862501600.

The previous prime is 2211110209999. The next prime is 2211110210033. The reversal of 2211110210021 is 1200120111122.

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 23405940100 + 2187704269921 = 152990^2 + 1479089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211110210021 - 2³⁰ = 2210036468197 is a prime.

It is a super-2 number, since 2×2211110210021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211110209978 and 2211110210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211110210081) 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, 18123854120 + ... + 18123854241.

It is an arithmetic number, because the mean of its divisors is an integer number (561839479611).

Almost surely, 2^{2211110210021} is an apocalyptic number.

It is an amenable number.

2211110210021 is a deficient number, since it is larger than the sum of its proper divisors (36247708423).

2211110210021 is an equidigital number, since it uses as much as digits as its factorization.

2211110210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36247708422.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2211110210021 its reverse (1200120111122), we get a palindrome (3411230321143).

The spelling of 2211110210021 in words is "two trillion, two hundred eleven billion, one hundred ten million, two hundred ten thousand, twenty-one".