12210019978 has 16 divisors (see below), whose sum is σ = 19734905736. Its totient is φ = 5632243200.

The previous prime is 12210019967. The next prime is 12210019981. The reversal of 12210019978 is 87991001221.

It can be written as a sum of positive squares in 4 ways, for example, as 8577908689 + 3632111289 = 92617^2 + 60267^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12210019978.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83551 + ... + 177202.

Almost surely, 2^12210019978 is an apocalyptic number.

12210019978 is a deficient number, since it is larger than the sum of its proper divisors (7524885758).

12210019978 is a wasteful number, since it uses less digits than its factorization.

12210019978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262569.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 12210019978 in words is "twelve billion, two hundred ten million, nineteen thousand, nine hundred seventy-eight".