20121111031338 has 64 divisors (see below), whose sum is σ = 46672762118400. Its totient is φ = 6413348620800.

The previous prime is 20121111031337. The next prime is 20121111031391. The reversal of 20121111031338 is 83313011112102.

20121111031338 is a `hidden beast` number, since 2 + 0 + 1 + 211 + 110 + 3 + 1 + 338 = 666.

It is a super-3 number, since 3×20121111031338³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20121111031331) 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, 1214238 + ... + 6458838.

It is an arithmetic number, because the mean of its divisors is an integer number (729261908100).

Almost surely, 2^{20121111031338} is an apocalyptic number.

20121111031338 is an abundant number, since it is smaller than the sum of its proper divisors (26551651087062).

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

20121111031338 is a wasteful number, since it uses less digits than its factorization.

20121111031338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5247724 (or 5247718 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 20121111031338 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, thirty-one thousand, three hundred thirty-eight".