21121102012 has 12 divisors (see below), whose sum is σ = 38907293320. Its totient is φ = 10004732496.

The previous prime is 21121101997. The next prime is 21121102049. The reversal of 21121102012 is 21020112112.

It is a super-2 number, since 2×21121102012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121101983 and 21121102001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138954543 + ... + 138954694.

Almost surely, 2^21121102012 is an apocalyptic number.

It is an amenable number.

21121102012 is a deficient number, since it is larger than the sum of its proper divisors (17786191308).

21121102012 is a wasteful number, since it uses less digits than its factorization.

21121102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277909260 (or 277909258 counting only the distinct ones).

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

Adding to 21121102012 its reverse (21020112112), we get a palindrome (42141214124).

The spelling of 21121102012 in words is "twenty-one billion, one hundred twenty-one million, one hundred two thousand, twelve".