9213691021 has 4 divisors (see below), whose sum is σ = 9227382172. Its totient is φ = 9199999872.

The previous prime is 9213691001. The next prime is 9213691037. The reversal of 9213691021 is 1201963129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1201963129 = 30169 ⋅39841.

It can be written as a sum of positive squares in 2 ways, for example, as 5327540100 + 3886150921 = 72990^2 + 62339^2 .

It is a cyclic number.

It is not a de Polignac number, because 9213691021 - 2²³ = 9205302413 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 (9213691001) 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, 6844566 + ... + 6845911.

It is an arithmetic number, because the mean of its divisors is an integer number (2306845543).

Almost surely, 2^9213691021 is an apocalyptic number.

It is an amenable number.

9213691021 is a deficient number, since it is larger than the sum of its proper divisors (13691151).

9213691021 is a wasteful number, since it uses less digits than its factorization.

9213691021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13691150.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 9213691021 is about 95987.9733143689. The cubic root of 9213691021 is about 2096.4180070837.

The spelling of 9213691021 in words is "nine billion, two hundred thirteen million, six hundred ninety-one thousand, twenty-one".