20101002111 has 12 divisors (see below), whose sum is σ = 29064695400. Its totient is φ = 13386861360.

The previous prime is 20101002107. The next prime is 20101002133. The reversal of 20101002111 is 11120010102.

It is a happy number.

It is not a de Polignac number, because 20101002111 - 2² = 20101002107 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 = 20101002093 and 20101002102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101004111) 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, 1141336 + ... + 1158813.

It is an arithmetic number, because the mean of its divisors is an integer number (2422057950).

Almost surely, 2^20101002111 is an apocalyptic number.

20101002111 is a deficient number, since it is larger than the sum of its proper divisors (8963693289).

20101002111 is a wasteful number, since it uses less digits than its factorization.

20101002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301126 (or 2301123 counting only the distinct ones).

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

Adding to 20101002111 its reverse (11120010102), we get a palindrome (31221012213).

The spelling of 20101002111 in words is "twenty billion, one hundred one million, two thousand, one hundred eleven".