78400021222 has 8 divisors (see below), whose sum is σ = 117643291200. Its totient is φ = 39185590824.

The previous prime is 78400021207. The next prime is 78400021277. The reversal of 78400021222 is 22212000487.

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

It is a super-2 number, since 2×78400021222² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7203097 + ... + 7213972.

It is an arithmetic number, because the mean of its divisors is an integer number (14705411400).

Almost surely, 2^78400021222 is an apocalyptic number.

78400021222 is a deficient number, since it is larger than the sum of its proper divisors (39243269978).

78400021222 is a wasteful number, since it uses less digits than its factorization.

78400021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14419790.

The product of its (nonzero) digits is 3584, while the sum is 28.

The spelling of 78400021222 in words is "seventy-eight billion, four hundred million, twenty-one thousand, two hundred twenty-two".