21011122122211 has 8 divisors (see below), whose sum is σ = 22628413995264. Its totient is φ = 19393980493440.

The previous prime is 21011122122203. The next prime is 21011122122293. The reversal of 21011122122211 is 11222122111012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011122122211 - 2³ = 21011122122203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011122122811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37270531 + ... + 37830076.

It is an arithmetic number, because the mean of its divisors is an integer number (2828551749408).

Almost surely, 2^{21011122122211} is an apocalyptic number.

21011122122211 is a deficient number, since it is larger than the sum of its proper divisors (1617291873053).

21011122122211 is a wasteful number, since it uses less digits than its factorization.

21011122122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75122141.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21011122122211 its reverse (11222122111012), we get a palindrome (32233244233223).

The spelling of 21011122122211 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred eleven".