21121212001012 has 12 divisors (see below), whose sum is σ = 36965083034880. Its totient is φ = 10559759705336.

The previous prime is 21121212001007. The next prime is 21121212001013. The reversal of 21121212001012 is 21010021212112.

It is a super-2 number, since 2×21121212001012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121212001013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211517638 + ... + 211617469.

It is an arithmetic number, because the mean of its divisors is an integer number (3080423586240).

Almost surely, 2^{21121212001012} is an apocalyptic number.

It is an amenable number.

21121212001012 is a deficient number, since it is larger than the sum of its proper divisors (15843871033868).

21121212001012 is a wasteful number, since it uses less digits than its factorization.

21121212001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423147590 (or 423147588 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121212001012 its reverse (21010021212112), we get a palindrome (42131233213124).

The spelling of 21121212001012 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, one thousand, twelve".