2011210122221 has 4 divisors (see below), whose sum is σ = 2011216007232. Its totient is φ = 2011204237212.

The previous prime is 2011210122217. The next prime is 2011210122239. The reversal of 2011210122221 is 1222210121102.

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 2011210122221 - 2² = 2011210122217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011210122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011210122721) 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, 2396051 + ... + 3124656.

It is an arithmetic number, because the mean of its divisors is an integer number (502804001808).

Almost surely, 2^{2011210122221} is an apocalyptic number.

It is an amenable number.

2011210122221 is a deficient number, since it is larger than the sum of its proper divisors (5885011).

2011210122221 is an equidigital number, since it uses as much as digits as its factorization.

2011210122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5885010.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2011210122221 its reverse (1222210121102), we get a palindrome (3233420243323).

The spelling of 2011210122221 in words is "two trillion, eleven billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".