6121533221 has 4 divisors (see below), whose sum is σ = 6443719200. Its totient is φ = 5799347244.

The previous prime is 6121533193. The next prime is 6121533227. The reversal of 6121533221 is 1223351216.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 6121533221 - 2⁶ = 6121533157 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 (6121533227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161092961 + ... + 161092998.

It is an arithmetic number, because the mean of its divisors is an integer number (1610929800).

Almost surely, 2^6121533221 is an apocalyptic number.

It is an amenable number.

6121533221 is a deficient number, since it is larger than the sum of its proper divisors (322185979).

6121533221 is a wasteful number, since it uses less digits than its factorization.

6121533221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322185978.

The product of its digits is 2160, while the sum is 26.

The square root of 6121533221 is about 78240.2276389838. The cubic root of 6121533221 is about 1829.3075924703.

Adding to 6121533221 its reverse (1223351216), we get a palindrome (7344884437).

The spelling of 6121533221 in words is "six billion, one hundred twenty-one million, five hundred thirty-three thousand, two hundred twenty-one".