11001121020 has 72 divisors (see below), whose sum is σ = 33574880976. Its totient is φ = 2915626752.

The previous prime is 11001121003. The next prime is 11001121037. The reversal of 11001121020 is 2012110011.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11001121003) and next prime (11001121037).

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 = 11001120993 and 11001121011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158137 + ... + 216816.

Almost surely, 2^11001121020 is an apocalyptic number.

11001121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11001121020 is an abundant number, since it is smaller than the sum of its proper divisors (22573759956).

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

11001121020 is a wasteful number, since it uses less digits than its factorization.

11001121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375131 (or 375126 counting only the distinct ones).

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

Adding to 11001121020 its reverse (2012110011), we get a palindrome (13013231031).

The spelling of 11001121020 in words is "eleven billion, one million, one hundred twenty-one thousand, twenty".