9956769221 has 4 divisors (see below), whose sum is σ = 11379164832. Its totient is φ = 8534373612.

The previous prime is 9956769217. The next prime is 9956769223. The reversal of 9956769221 is 1229676599.

9956769221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9956769221 - 2² = 9956769217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9956769223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711197795 + ... + 711197808.

It is an arithmetic number, because the mean of its divisors is an integer number (2844791208).

Almost surely, 2^9956769221 is an apocalyptic number.

It is an amenable number.

9956769221 is a deficient number, since it is larger than the sum of its proper divisors (1422395611).

9956769221 is a wasteful number, since it uses less digits than its factorization.

9956769221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422395610.

The product of its digits is 3674160, while the sum is 56.

The square root of 9956769221 is about 99783.6119861373. The cubic root of 9956769221 is about 2151.3256091203.

The spelling of 9956769221 in words is "nine billion, nine hundred fifty-six million, seven hundred sixty-nine thousand, two hundred twenty-one".