11211001020 has 60 divisors (see below), whose sum is σ = 35169330504. Its totient is φ = 2989599840.

The previous prime is 11211001007. The next prime is 11211001049. The reversal of 11211001020 is 2010011211.

It is a happy number.

11211001020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (60).

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 = 11211000993 and 11211001011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3458566 + ... + 3461805.

Almost surely, 2^11211001020 is an apocalyptic number.

11211001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211001020 is an abundant number, since it is smaller than the sum of its proper divisors (23958329484).

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

11211001020 is a wasteful number, since it uses less digits than its factorization.

11211001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6920392 (or 6920381 counting only the distinct ones).

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

Adding to 11211001020 its reverse (2010011211), we get a palindrome (13221012231).

The spelling of 11211001020 in words is "eleven billion, two hundred eleven million, one thousand, twenty".