21012111219 has 32 divisors (see below), whose sum is σ = 31905312768. Its totient is φ = 12175812000.

The previous prime is 21012111167. The next prime is 21012111251. The reversal of 21012111219 is 91211121012.

It is not a de Polignac number, because 21012111219 - 2¹⁷ = 21011980147 is a prime.

It is a super-2 number, since 2×21012111219² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012111195 and 21012111204.

It is not an unprimeable number, because it can be changed into a prime (21012111319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2524074 + ... + 2532384.

It is an arithmetic number, because the mean of its divisors is an integer number (997041024).

Almost surely, 2^21012111219 is an apocalyptic number.

21012111219 is a deficient number, since it is larger than the sum of its proper divisors (10893201549).

21012111219 is a wasteful number, since it uses less digits than its factorization.

21012111219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11679.

The product of its (nonzero) digits is 72, while the sum is 21.

It can be divided in two parts, 21012 and 111219, that added together give a palindrome (132231).

The spelling of 21012111219 in words is "twenty-one billion, twelve million, one hundred eleven thousand, two hundred nineteen".