20102111010 has 40 divisors (see below), whose sum is σ = 54052345116. Its totient is φ = 5360562720.

The previous prime is 20102110961. The next prime is 20102111039. The reversal of 20102111010 is 1011120102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19897077249 + 205033761 = 141057^2 + 14319^2 .

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 = 20102110983 and 20102111001.

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 19 ways as a sum of consecutive naturals, for example, 12407901 + ... + 12409520.

Almost surely, 2^20102111010 is an apocalyptic number.

20102111010 is an abundant number, since it is smaller than the sum of its proper divisors (33950234106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20102111010 is a wasteful number, since it uses less digits than its factorization.

20102111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24817440 (or 24817431 counting only the distinct ones).

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

Adding to 20102111010 its reverse (1011120102), we get a palindrome (21113231112).

The spelling of 20102111010 in words is "twenty billion, one hundred two million, one hundred eleven thousand, ten".