921003132221 has 4 divisors (see below), whose sum is σ = 921122117244. Its totient is φ = 920884147200.

The previous prime is 921003132173. The next prime is 921003132223. The reversal of 921003132221 is 122231300129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 637899326596 + 283103805625 = 798686^2 + 532075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921003132221 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 (921003132223) 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, 59480900 + ... + 59496381.

It is an arithmetic number, because the mean of its divisors is an integer number (230280529311).

Almost surely, 2^921003132221 is an apocalyptic number.

It is an amenable number.

921003132221 is a deficient number, since it is larger than the sum of its proper divisors (118985023).

921003132221 is a wasteful number, since it uses less digits than its factorization.

921003132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118985022.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 921003132221 in words is "nine hundred twenty-one billion, three million, one hundred thirty-two thousand, two hundred twenty-one".