9427423708921 has 9 divisors (see below), whose sum is σ = 9534816378511. Its totient is φ = 9321227403664.

The previous prime is 9427423708919. The next prime is 9427423708939. The reversal of 9427423708921 is 1298073247249.

The square root of 9427423708921 is 3070411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1810265302521 + 7617158406400 = 1345461^2 + 2759920^2 .

It is not a de Polignac number, because 9427423708921 - 2¹ = 9427423708919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9427423708951) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 273249330 + ... + 273283828.

Almost surely, 2^{9427423708921} is an apocalyptic number.

9427423708921 is the 3070411-st square number.

9427423708921 is the 1535206-th centered octagonal number.

It is an amenable number.

9427423708921 is a deficient number, since it is larger than the sum of its proper divisors (107392669590).

9427423708921 is an frugal number, since it uses more digits than its factorization.

9427423708921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69176 (or 34588 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 9427423708921 in words is "nine trillion, four hundred twenty-seven billion, four hundred twenty-three million, seven hundred eight thousand, nine hundred twenty-one".