2201212019978 has 4 divisors (see below), whose sum is σ = 3301818029970. Its totient is φ = 1100606009988.

The previous prime is 2201212019969. The next prime is 2201212020071. The reversal of 2201212019978 is 8799102121022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2077682967889 + 123529052089 = 1441417^2 + 351467^2 .

It is a super-2 number, since 2×2201212019978² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550303004993 + ... + 550303004996.

Almost surely, 2^{2201212019978} is an apocalyptic number.

2201212019978 is a deficient number, since it is larger than the sum of its proper divisors (1100606009992).

2201212019978 is a wasteful number, since it uses less digits than its factorization.

2201212019978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100606009991.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 2201212019978 in words is "two trillion, two hundred one billion, two hundred twelve million, nineteen thousand, nine hundred seventy-eight".