9775967421 has 16 divisors (see below), whose sum is σ = 14452699968. Its totient is φ = 5827699200.

The previous prime is 9775967401. The next prime is 9775967473. The reversal of 9775967421 is 1247695779.

It is a happy number.

It is not a de Polignac number, because 9775967421 - 2⁷ = 9775967293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9775967401) 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, 2426196 + ... + 2430221.

It is an arithmetic number, because the mean of its divisors is an integer number (903293748).

Almost surely, 2^9775967421 is an apocalyptic number.

It is an amenable number.

9775967421 is a deficient number, since it is larger than the sum of its proper divisors (4676732547).

9775967421 is a wasteful number, since it uses less digits than its factorization.

9775967421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4856492.

The product of its digits is 6667920, while the sum is 57.

The square root of 9775967421 is about 98873.4920036710. The cubic root of 9775967421 is about 2138.2242395443.

The spelling of 9775967421 in words is "nine billion, seven hundred seventy-five million, nine hundred sixty-seven thousand, four hundred twenty-one".