20111219989 has 48 divisors (see below), whose sum is σ = 24092909568. Its totient is φ = 16734640608.

The previous prime is 20111219981. The next prime is 20111220007. The reversal of 20111219989 is 98991211102.

It is a happy number.

It is not a de Polignac number, because 20111219989 - 2³ = 20111219981 is a prime.

It is a super-2 number, since 2×20111219989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111219981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90184732 + ... + 90184954.

It is an arithmetic number, because the mean of its divisors is an integer number (501935616).

Almost surely, 2^20111219989 is an apocalyptic number.

It is an amenable number.

20111219989 is a deficient number, since it is larger than the sum of its proper divisors (3981689579).

20111219989 is a wasteful number, since it uses less digits than its factorization.

20111219989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 43.

It can be divided in two parts, 20111 and 219989, that added together give a square (240100 = 490²).

The spelling of 20111219989 in words is "twenty billion, one hundred eleven million, two hundred nineteen thousand, nine hundred eighty-nine".