9721240436 has 24 divisors (see below), whose sum is σ = 17476273416. Its totient is φ = 4728084480.

The previous prime is 9721240429. The next prime is 9721240439. The reversal of 9721240436 is 6340421279.

It can be written as a sum of positive squares in 4 ways, for example, as 1117564900 + 8603675536 = 33430^2 + 92756^2 .

It is a super-2 number, since 2×9721240436² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9721240436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721240439) 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, 1156280 + ... + 1164656.

It is an arithmetic number, because the mean of its divisors is an integer number (728178059).

Almost surely, 2^9721240436 is an apocalyptic number.

It is an amenable number.

9721240436 is a deficient number, since it is larger than the sum of its proper divisors (7755032980).

9721240436 is a wasteful number, since it uses less digits than its factorization.

9721240436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16259 (or 16257 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 9721240436 is about 98596.3510278144. The cubic root of 9721240436 is about 2134.2267627523.

The spelling of 9721240436 in words is "nine billion, seven hundred twenty-one million, two hundred forty thousand, four hundred thirty-six".