12211621521 has 8 divisors (see below), whose sum is σ = 17762358624. Its totient is φ = 7400982720.

The previous prime is 12211621517. The next prime is 12211621547. The reversal of 12211621521 is 12512611221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12211621521 - 2² = 12211621517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12211621491 and 12211621500.

It is not an unprimeable number, because it can be changed into a prime (12211621561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185024536 + ... + 185024601.

It is an arithmetic number, because the mean of its divisors is an integer number (2220294828).

Almost surely, 2^12211621521 is an apocalyptic number.

12211621521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211621521 is a deficient number, since it is larger than the sum of its proper divisors (5550737103).

12211621521 is a wasteful number, since it uses less digits than its factorization.

12211621521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370049151.

The product of its digits is 480, while the sum is 24.

The spelling of 12211621521 in words is "twelve billion, two hundred eleven million, six hundred twenty-one thousand, five hundred twenty-one".