21000000000012 has 24 divisors (see below), whose sum is σ = 53454545454912. Its totient is φ = 6363636363600.

The previous prime is 20999999999987. The next prime is 21000000000013.

It is a happy number.

21000000000012 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a self number, because there is not a number n which added to its sum of digits gives 21000000000012.

It is not an unprimeable number, because it can be changed into a prime (21000000000013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79545454414 + ... + 79545454677.

It is an arithmetic number, because the mean of its divisors is an integer number (2227272727288).

Almost surely, 2^{21000000000012} is an apocalyptic number.

21000000000012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000000000012 is an abundant number, since it is smaller than the sum of its proper divisors (32454545454900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000000000012 is a wasteful number, since it uses less digits than its factorization.

21000000000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159090909109 (or 159090909107 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

It can be divided in two parts, 210000000000 and 12, that added together give a palindrome (210000000012).

The spelling of 21000000000012 in words is "twenty-one trillion, twelve", and thus it is an aban number and an uban number.