11020020131 has 4 divisors (see below), whose sum is σ = 11030159232. Its totient is φ = 11009881032.

The previous prime is 11020020119. The next prime is 11020020133. The reversal of 11020020131 is 13102002011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11020020131 is a prime.

It is a super-2 number, since 2×11020020131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11020020133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5067920 + ... + 5070093.

It is an arithmetic number, because the mean of its divisors is an integer number (2757539808).

Almost surely, 2^11020020131 is an apocalyptic number.

11020020131 is a deficient number, since it is larger than the sum of its proper divisors (10139101).

11020020131 is a wasteful number, since it uses less digits than its factorization.

11020020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139100.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 11020020131 its reverse (13102002011), we get a palindrome (24122022142).

The spelling of 11020020131 in words is "eleven billion, twenty million, twenty thousand, one hundred thirty-one".