9621042121 has 4 divisors (see below), whose sum is σ = 9621687172. Its totient is φ = 9620397072.

The previous prime is 9621042113. The next prime is 9621042127. The reversal of 9621042121 is 1212401269.

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 4951233225 + 4669808896 = 70365^2 + 68336^2 .

It is a cyclic number.

It is not a de Polignac number, because 9621042121 - 2³ = 9621042113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9621042121.

It is not an unprimeable number, because it can be changed into a prime (9621042127) 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, 299610 + ... + 330163.

It is an arithmetic number, because the mean of its divisors is an integer number (2405421793).

Almost surely, 2^9621042121 is an apocalyptic number.

It is an amenable number.

9621042121 is a deficient number, since it is larger than the sum of its proper divisors (645051).

9621042121 is a wasteful number, since it uses less digits than its factorization.

9621042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645050.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 9621042121 is about 98086.9110585097. The cubic root of 9621042121 is about 2126.8688239735.

The spelling of 9621042121 in words is "nine billion, six hundred twenty-one million, forty-two thousand, one hundred twenty-one".