78281224021 has 96 divisors (see below), whose sum is σ = 107971522560. Its totient is φ = 55099699200.

The previous prime is 78281224001. The next prime is 78281224033. The reversal of 78281224021 is 12042218287.

It is not a de Polignac number, because 78281224021 - 2⁷ = 78281223893 is a prime.

It is a super-2 number, since 2×78281224021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78281224001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 178316920 + ... + 178317358.

It is an arithmetic number, because the mean of its divisors is an integer number (1124703360).

Almost surely, 2^78281224021 is an apocalyptic number.

78281224021 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

78281224021 is a deficient number, since it is larger than the sum of its proper divisors (29690298539).

78281224021 is a wasteful number, since it uses less digits than its factorization.

78281224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The spelling of 78281224021 in words is "seventy-eight billion, two hundred eighty-one million, two hundred twenty-four thousand, twenty-one".