21012212012012 has 24 divisors (see below), whose sum is σ = 39605253467472. Its totient is φ = 9696642264000.

The previous prime is 21012212011991. The next prime is 21012212012017. The reversal of 21012212012012 is 21021021221012.

It is not an unprimeable number, because it can be changed into a prime (21012212012017) 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, 26728439 + ... + 27503342.

It is an arithmetic number, because the mean of its divisors is an integer number (1650218894478).

Almost surely, 2^{21012212012012} is an apocalyptic number.

It is an amenable number.

21012212012012 is a deficient number, since it is larger than the sum of its proper divisors (18593041455460).

21012212012012 is a wasteful number, since it uses less digits than its factorization.

21012212012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54239249 (or 54239247 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012212012012 its reverse (21021021221012), we get a palindrome (42033233233024).

The spelling of 21012212012012 in words is "twenty-one trillion, twelve billion, two hundred twelve million, twelve thousand, twelve".