78222021123 has 32 divisors (see below), whose sum is σ = 109212364800. Its totient is φ = 49746393216.

The previous prime is 78222021121. The next prime is 78222021167. The reversal of 78222021123 is 32112022287.

It is a Cunningham number, because it is equal to 279682²-1.

It is not a de Polignac number, because 78222021123 - 2¹ = 78222021121 is a prime.

It is a super-2 number, since 2×78222021123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78222021121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10344418 + ... + 10351976.

It is an arithmetic number, because the mean of its divisors is an integer number (3412886400).

Almost surely, 2^78222021123 is an apocalyptic number.

78222021123 is a deficient number, since it is larger than the sum of its proper divisors (30990343677).

78222021123 is a wasteful number, since it uses less digits than its factorization.

78222021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411.

The product of its (nonzero) digits is 5376, while the sum is 30.

The spelling of 78222021123 in words is "seventy-eight billion, two hundred twenty-two million, twenty-one thousand, one hundred twenty-three".