9720552121 has 8 divisors (see below), whose sum is σ = 11111183424. Its totient is φ = 8330416080.

The previous prime is 9720552109. The next prime is 9720552131. The reversal of 9720552121 is 1212550279.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9720552121 - 2¹³ = 9720543929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720552131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80755 + ... + 161128.

It is an arithmetic number, because the mean of its divisors is an integer number (1388897928).

Almost surely, 2^9720552121 is an apocalyptic number.

It is an amenable number.

9720552121 is a deficient number, since it is larger than the sum of its proper divisors (1390631303).

9720552121 is a wasteful number, since it uses less digits than its factorization.

9720552121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247631.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 9720552121 is about 98592.8603956696. The cubic root of 9720552121 is about 2134.1763900666.

The spelling of 9720552121 in words is "nine billion, seven hundred twenty million, five hundred fifty-two thousand, one hundred twenty-one".