9919464121 has 16 divisors (see below), whose sum is σ = 11936406400. Its totient is φ = 8052732288.

The previous prime is 9919464119. The next prime is 9919464133. The reversal of 9919464121 is 1214649199.

It is a cyclic number.

It is not a de Polignac number, because 9919464121 - 2¹ = 9919464119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9919464151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645301 + ... + 660493.

It is an arithmetic number, because the mean of its divisors is an integer number (746025400).

Almost surely, 2^9919464121 is an apocalyptic number.

It is an amenable number.

9919464121 is a deficient number, since it is larger than the sum of its proper divisors (2016942279).

9919464121 is a wasteful number, since it uses less digits than its factorization.

9919464121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20128.

The product of its digits is 139968, while the sum is 46.

The square root of 9919464121 is about 99596.5065702608. The cubic root of 9919464121 is about 2148.6354507789.

The spelling of 9919464121 in words is "nine billion, nine hundred nineteen million, four hundred sixty-four thousand, one hundred twenty-one".