20101110021 has 24 divisors (see below), whose sum is σ = 30590456000. Its totient is φ = 12684071232.

The previous prime is 20101110019. The next prime is 20101110053. The reversal of 20101110021 is 12001110102.

It is a happy number.

It is not a de Polignac number, because 20101110021 - 2¹ = 20101110019 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 = 20101109985 and 20101110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101110011) 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, 141000 + ... + 245118.

Almost surely, 2^20101110021 is an apocalyptic number.

It is an amenable number.

20101110021 is a deficient number, since it is larger than the sum of its proper divisors (10489345979).

20101110021 is a wasteful number, since it uses less digits than its factorization.

20101110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105273 (or 105270 counting only the distinct ones).

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

Adding to 20101110021 its reverse (12001110102), we get a palindrome (32102220123).

The spelling of 20101110021 in words is "twenty billion, one hundred one million, one hundred ten thousand, twenty-one".