20011021101 has 12 divisors (see below), whose sum is σ = 28929507360. Its totient is φ = 13329281160.

The previous prime is 20011021099. The next prime is 20011021109. The reversal of 20011021101 is 10112011002.

It is a happy number.

It is not a de Polignac number, because 20011021101 - 2¹ = 20011021099 is a prime.

It is a super-3 number, since 3×20011021101³ (a number of 32 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011021109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 938841 + ... + 959918.

It is an arithmetic number, because the mean of its divisors is an integer number (2410792280).

Almost surely, 2^20011021101 is an apocalyptic number.

It is an amenable number.

20011021101 is a deficient number, since it is larger than the sum of its proper divisors (8918486259).

20011021101 is a wasteful number, since it uses less digits than its factorization.

20011021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899936 (or 1899933 counting only the distinct ones).

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

Adding to 20011021101 its reverse (10112011002), we get a palindrome (30123032103).

The spelling of 20011021101 in words is "twenty billion, eleven million, twenty-one thousand, one hundred one".