11011111020 has 144 divisors (see below), whose sum is σ = 41108208960. Its totient is φ = 2323219968.

The previous prime is 11011111009. The next prime is 11011111031. The reversal of 11011111020 is 2011111011.

It is an interprime number because it is at equal distance from previous prime (11011111009) and next prime (11011111031).

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 = 11011110993 and 11011111011.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 319735 + ... + 352494.

Almost surely, 2^11011111020 is an apocalyptic number.

11011111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11011111020 is an abundant number, since it is smaller than the sum of its proper divisors (30097097940).

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

11011111020 is a wasteful number, since it uses less digits than its factorization.

11011111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672264 (or 672259 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 11011111020 its reverse (2011111011), we get a palindrome (13022222031).

Subtracting from 11011111020 its reverse (2011111011), we obtain a palindrome (9000000009).

The spelling of 11011111020 in words is "eleven billion, eleven million, one hundred eleven thousand, twenty".