11375821221 has 16 divisors (see below), whose sum is σ = 15435376320. Its totient is φ = 7451084160.

The previous prime is 11375821187. The next prime is 11375821241. The reversal of 11375821221 is 12212857311.

It is not a de Polignac number, because 11375821221 - 2¹⁵ = 11375788453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11375821241) 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, 81136 + ... + 171273.

It is an arithmetic number, because the mean of its divisors is an integer number (964711020).

Almost surely, 2^11375821221 is an apocalyptic number.

It is an amenable number.

11375821221 is a deficient number, since it is larger than the sum of its proper divisors (4059555099).

11375821221 is a wasteful number, since it uses less digits than its factorization.

11375821221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252676.

The product of its digits is 6720, while the sum is 33.

The spelling of 11375821221 in words is "eleven billion, three hundred seventy-five million, eight hundred twenty-one thousand, two hundred twenty-one".