11203121020 has 48 divisors (see below), whose sum is σ = 28955763648. Its totient is φ = 3545602560.

The previous prime is 11203121011. The next prime is 11203121029. The reversal of 11203121020 is 2012130211.

It is an interprime number because it is at equal distance from previous prime (11203121011) and next prime (11203121029).

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11203121029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3075961 + ... + 3079600.

It is an arithmetic number, because the mean of its divisors is an integer number (603245076).

Almost surely, 2^11203121020 is an apocalyptic number.

11203121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11203121020 is an abundant number, since it is smaller than the sum of its proper divisors (17752642628).

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

11203121020 is a wasteful number, since it uses less digits than its factorization.

11203121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6155590 (or 6155588 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 11203121020 its reverse (2012130211), we get a palindrome (13215251231).

The spelling of 11203121020 in words is "eleven billion, two hundred three million, one hundred twenty-one thousand, twenty".