9021248781 has 8 divisors (see below), whose sum is σ = 12735880704. Its totient is φ = 5660391360.

The previous prime is 9021248771. The next prime is 9021248801. The reversal of 9021248781 is 1878421209.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9021248781 - 2⁵ = 9021248749 is a prime.

It is a super-2 number, since 2×9021248781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9021248771) 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, 88443565 + ... + 88443666.

It is an arithmetic number, because the mean of its divisors is an integer number (1591985088).

Almost surely, 2^9021248781 is an apocalyptic number.

It is an amenable number.

9021248781 is a deficient number, since it is larger than the sum of its proper divisors (3714631923).

9021248781 is a wasteful number, since it uses less digits than its factorization.

9021248781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176887251.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 9021248781 is about 94980.2546901197. The cubic root of 9021248781 is about 2081.7195455231.

The spelling of 9021248781 in words is "nine billion, twenty-one million, two hundred forty-eight thousand, seven hundred eighty-one".