21000100012012 has 48 divisors (see below), whose sum is σ = 41055085475712. Its totient is φ = 9316322023680.

The previous prime is 21000100012009. The next prime is 21000100012049. The reversal of 21000100012012 is 21021000100012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000100012012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1824958 + ... + 6732805.

It is an arithmetic number, because the mean of its divisors is an integer number (855314280744).

Almost surely, 2^{21000100012012} is an apocalyptic number.

21000100012012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000100012012 is a deficient number, since it is larger than the sum of its proper divisors (20054985463700).

21000100012012 is a wasteful number, since it uses less digits than its factorization.

21000100012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8559118 (or 8559116 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000100012012 its reverse (21021000100012), we get a palindrome (42021100112024).

The spelling of 21000100012012 in words is "twenty-one trillion, one hundred million, twelve thousand, twelve".