20111021211 has 8 divisors (see below), whose sum is σ = 26843316304. Its totient is φ = 13393036800.

The previous prime is 20111021197. The next prime is 20111021237. The reversal of 20111021211 is 11212011102.

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

It is not a de Polignac number, because 20111021211 - 2⁵ = 20111021179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111031211) 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, 3574390 + ... + 3580011.

It is an arithmetic number, because the mean of its divisors is an integer number (3355414538).

Almost surely, 2^20111021211 is an apocalyptic number.

20111021211 is a deficient number, since it is larger than the sum of its proper divisors (6732295093).

20111021211 is an equidigital number, since it uses as much as digits as its factorization.

20111021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7155341.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20111021211 its reverse (11212011102), we get a palindrome (31323032313).

The spelling of 20111021211 in words is "twenty billion, one hundred eleven million, twenty-one thousand, two hundred eleven".