20111213772 has 72 divisors (see below), whose sum is σ = 55518372000. Its totient is φ = 6100899840.

The previous prime is 20111213753. The next prime is 20111213779. The reversal of 20111213772 is 27731211102.

It is not an unprimeable number, because it can be changed into a prime (20111213779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269397 + ... + 335852.

It is an arithmetic number, because the mean of its divisors is an integer number (771088500).

Almost surely, 2^20111213772 is an apocalyptic number.

It is an amenable number.

20111213772 is an abundant number, since it is smaller than the sum of its proper divisors (35407158228).

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

20111213772 is a wasteful number, since it uses less digits than its factorization.

20111213772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605343 (or 605338 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

Adding to 20111213772 its reverse (27731211102), we get a palindrome (47842424874).

The spelling of 20111213772 in words is "twenty billion, one hundred eleven million, two hundred thirteen thousand, seven hundred seventy-two".