11940501221 has 16 divisors (see below), whose sum is σ = 13620400128. Its totient is φ = 10361617200.

The previous prime is 11940501193. The next prime is 11940501253. The reversal of 11940501221 is 12210504911.

It is a de Polignac number, because none of the positive numbers 2^k-11940501221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11940501121) 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, 74756 + ... + 171666.

It is an arithmetic number, because the mean of its divisors is an integer number (851275008).

Almost surely, 2^11940501221 is an apocalyptic number.

11940501221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11940501221 is a deficient number, since it is larger than the sum of its proper divisors (1679898907).

11940501221 is a wasteful number, since it uses less digits than its factorization.

11940501221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97432.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 11940501221 in words is "eleven billion, nine hundred forty million, five hundred one thousand, two hundred twenty-one".