12100021011 has 24 divisors (see below), whose sum is σ = 18830180096. Its totient is φ = 7443031680.

The previous prime is 12100021007. The next prime is 12100021019. The reversal of 12100021011 is 11012000121.

It is a happy number.

It is not a de Polignac number, because 12100021011 - 2² = 12100021007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12100020984 and 12100021002.

It is not an unprimeable number, because it can be changed into a prime (12100021019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274446 + ... + 315468.

Almost surely, 2^12100021011 is an apocalyptic number.

12100021011 is a deficient number, since it is larger than the sum of its proper divisors (6730159085).

12100021011 is a wasteful number, since it uses less digits than its factorization.

12100021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43563 (or 43560 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12100021011 its reverse (11012000121), we get a palindrome (23112021132).

The spelling of 12100021011 in words is "twelve billion, one hundred million, twenty-one thousand, eleven".