9021205440 has 224 divisors, whose sum is σ = 34273296960. Its totient is φ = 2220576768.

The previous prime is 9021205439. The next prime is 9021205469. The reversal of 9021205440 is 445021209.

9021205440 is a `hidden beast` number, since 9 + 0 + 212 + 0 + 5 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72162 + ... + 152478.

It is an arithmetic number, because the mean of its divisors is an integer number (153005790).

Almost surely, 2^9021205440 is an apocalyptic number.

9021205440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9021205440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17136648480).

9021205440 is an abundant number, since it is smaller than the sum of its proper divisors (25252091520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9021205440 is a wasteful number, since it uses less digits than its factorization.

9021205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80356 (or 80340 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 9021205440 is about 94980.0265318977. The cubic root of 9021205440 is about 2081.7162117662.

Adding to 9021205440 its reverse (445021209), we get a palindrome (9466226649).

The spelling of 9021205440 in words is "nine billion, twenty-one million, two hundred five thousand, four hundred forty".