10111020138 has 24 divisors (see below), whose sum is σ = 21914989668. Its totient is φ = 3369143232.

The previous prime is 10111020131. The next prime is 10111020151. The reversal of 10111020138 is 83102011101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9618313329 + 492706809 = 98073^2 + 22197^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 10111020138.

It is not an unprimeable number, because it can be changed into a prime (10111020131) 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, 46881 + ... + 149732.

Almost surely, 2^10111020138 is an apocalyptic number.

10111020138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

10111020138 is an abundant number, since it is smaller than the sum of its proper divisors (11803969530).

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

10111020138 is a wasteful number, since it uses less digits than its factorization.

10111020138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199478 (or 199475 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 10111020138 its reverse (83102011101), we get a palindrome (93213031239).

The spelling of 10111020138 in words is "ten billion, one hundred eleven million, twenty thousand, one hundred thirty-eight".