21212011012 has 12 divisors (see below), whose sum is σ = 37123741900. Its totient is φ = 10605227616.

The previous prime is 21212010997. The next prime is 21212011021. The reversal of 21212011012 is 21011021212.

It can be written as a sum of positive squares in 2 ways, for example, as 8839008256 + 12373002756 = 94016^2 + 111234^2 .

It is a super-2 number, since 2×21212011012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212010983 and 21212011001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130803 + ... + 243994.

Almost surely, 2^21212011012 is an apocalyptic number.

It is an amenable number.

21212011012 is a deficient number, since it is larger than the sum of its proper divisors (15911730888).

21212011012 is a wasteful number, since it uses less digits than its factorization.

21212011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388950 (or 388948 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212011012 its reverse (21011021212), we get a palindrome (42223032224).

The spelling of 21212011012 in words is "twenty-one billion, two hundred twelve million, eleven thousand, twelve".