2011212222221 has 4 divisors (see below), whose sum is σ = 2011225899552. Its totient is φ = 2011198544892.

The previous prime is 2011212222121. The next prime is 2011212222241. The reversal of 2011212222221 is 1222222121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011212222221 - 2³⁸ = 1736334315277 is a prime.

It is a super-2 number, since 2×2011212222221² (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 = 2011212222193 and 2011212222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011212222241) 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, 6615671 + ... + 6912996.

It is an arithmetic number, because the mean of its divisors is an integer number (502806474888).

Almost surely, 2^{2011212222221} is an apocalyptic number.

It is an amenable number.

2011212222221 is a deficient number, since it is larger than the sum of its proper divisors (13677331).

2011212222221 is a wasteful number, since it uses less digits than its factorization.

2011212222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13677330.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2011212222221 its reverse (1222222121102), we get a palindrome (3233434343323).

The spelling of 2011212222221 in words is "two trillion, eleven billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".