9212921 has 4 divisors (see below), whose sum is σ = 9510144. Its totient is φ = 8915700.

The previous prime is 9212911. The next prime is 9212927. The reversal of 9212921 is 1292129.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1292129 = 71 ⋅18199.

It is a cyclic number.

It is not a de Polignac number, because 9212921 - 2²² = 5018617 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9212927) 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, 148565 + ... + 148626.

It is an arithmetic number, because the mean of its divisors is an integer number (2377536).

Almost surely, 2^9212921 is an apocalyptic number.

It is an amenable number.

9212921 is a deficient number, since it is larger than the sum of its proper divisors (297223).

9212921 is a wasteful number, since it uses less digits than its factorization.

9212921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297222.

The product of its digits is 648, while the sum is 26.

The square root of 9212921 is about 3035.2793940591. The cubic root of 9212921 is about 209.6359603748.

The spelling of 9212921 in words is "nine million, two hundred twelve thousand, nine hundred twenty-one".