9219471921 has 20 divisors (see below), whose sum is σ = 15024326064. Its totient is φ = 5587558200.

The previous prime is 9219471913. The next prime is 9219471931. The reversal of 9219471921 is 1291749129.

It is a happy number.

9219471921 is a `hidden beast` number, since 92 + 1 + 9 + 471 + 92 + 1 = 666.

It is not a de Polignac number, because 9219471921 - 2³ = 9219471913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9219471901) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5172775 + ... + 5174556.

Almost surely, 2^9219471921 is an apocalyptic number.

It is an amenable number.

9219471921 is a deficient number, since it is larger than the sum of its proper divisors (5804854143).

9219471921 is a wasteful number, since it uses less digits than its factorization.

9219471921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10347354 (or 10347345 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 9219471921 is about 96018.0812191121. The cubic root of 9219471921 is about 2096.8563637672.

The spelling of 9219471921 in words is "nine billion, two hundred nineteen million, four hundred seventy-one thousand, nine hundred twenty-one".