20111121378 has 24 divisors (see below), whose sum is σ = 43592398668. Its totient is φ = 6700891392.

The previous prime is 20111121341. The next prime is 20111121379. The reversal of 20111121378 is 87312111102.

It can be written as a sum of positive squares in 2 ways, for example, as 20109225249 + 1896129 = 141807^2 + 1377^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20111121379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190375 + ... + 276522.

Almost surely, 2^20111121378 is an apocalyptic number.

20111121378 is an abundant number, since it is smaller than the sum of its proper divisors (23481277290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111121378 is a wasteful number, since it uses less digits than its factorization.

20111121378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469298 (or 469295 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The spelling of 20111121378 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, three hundred seventy-eight".