111212000020 has 48 divisors (see below), whose sum is σ = 255646274688. Its totient is φ = 40302680960.

The previous prime is 111211999991. The next prime is 111212000023. The reversal of 111212000020 is 20000212111.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 111211999970 and 111212000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212000023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 798184 + ... + 927103.

It is an arithmetic number, because the mean of its divisors is an integer number (5325964056).

Almost surely, 2^111212000020 is an apocalyptic number.

111212000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212000020 is an abundant number, since it is smaller than the sum of its proper divisors (144434274668).

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

111212000020 is a wasteful number, since it uses less digits than its factorization.

111212000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725600 (or 1725598 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 111212000020 its reverse (20000212111), we get a palindrome (131212212131).

The spelling of 111212000020 in words is "one hundred eleven billion, two hundred twelve million, twenty", and thus it is an aban number.