11867357221 has 4 divisors (see below), whose sum is σ = 11891140000. Its totient is φ = 11843574444.

The previous prime is 11867357209. The next prime is 11867357273. The reversal of 11867357221 is 12275376811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12275376811 = 1637 ⋅7498703.

It is a cyclic number.

It is not a de Polignac number, because 11867357221 - 2¹³ = 11867349029 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 (11867357321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11890641 + ... + 11891638.

It is an arithmetic number, because the mean of its divisors is an integer number (2972785000).

Almost surely, 2^11867357221 is an apocalyptic number.

It is an amenable number.

11867357221 is a deficient number, since it is larger than the sum of its proper divisors (23782779).

11867357221 is an equidigital number, since it uses as much as digits as its factorization.

11867357221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23782778.

The product of its digits is 141120, while the sum is 43.

The spelling of 11867357221 in words is "eleven billion, eight hundred sixty-seven million, three hundred fifty-seven thousand, two hundred twenty-one".