21011211211012 has 48 divisors (see below), whose sum is σ = 40641139832832. Its totient is φ = 9425318014880.

The previous prime is 21011211211009. The next prime is 21011211211013.

21011211211012 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21011211211013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7246348 + ... + 9722755.

It is an arithmetic number, because the mean of its divisors is an integer number (846690413184).

Almost surely, 2^{21011211211012} is an apocalyptic number.

21011211211012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011211211012 is a deficient number, since it is larger than the sum of its proper divisors (19629928621820).

21011211211012 is a wasteful number, since it uses less digits than its factorization.

21011211211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16969488 (or 16969486 counting only the distinct ones).

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

It can be divided in two parts, 2101121 and 1211012, that added together give a palindrome (3312133).

The spelling of 21011211211012 in words is "twenty-one trillion, eleven billion, two hundred eleven million, two hundred eleven thousand, twelve".