11001201021 has 12 divisors (see below), whose sum is σ = 15892002048. Its totient is φ = 7333497864.

The previous prime is 11001201019. The next prime is 11001201091. The reversal of 11001201021 is 12010210011.

It is a happy number.

It is not a de Polignac number, because 11001201021 - 2¹ = 11001201019 is a prime.

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 = 11001200994 and 11001201012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001201091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72036 + ... + 164898.

It is an arithmetic number, because the mean of its divisors is an integer number (1324333504).

Almost surely, 2^11001201021 is an apocalyptic number.

It is an amenable number.

11001201021 is a deficient number, since it is larger than the sum of its proper divisors (4890801027).

11001201021 is a wasteful number, since it uses less digits than its factorization.

11001201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106032 (or 106029 counting only the distinct ones).

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

Adding to 11001201021 its reverse (12010210011), we get a palindrome (23011411032).

The spelling of 11001201021 in words is "eleven billion, one million, two hundred one thousand, twenty-one".