101123221212 has 144 divisors (see below), whose sum is σ = 287595715680. Its totient is φ = 29744064000.

The previous prime is 101123221187. The next prime is 101123221237. The reversal of 101123221212 is 212122321101.

It is an interprime number because it is at equal distance from previous prime (101123221187) and next prime (101123221237).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1333887 + ... + 1407657.

It is an arithmetic number, because the mean of its divisors is an integer number (1997192470).

Almost surely, 2^101123221212 is an apocalyptic number.

101123221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101123221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143797857840).

101123221212 is an abundant number, since it is smaller than the sum of its proper divisors (186472494468).

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

101123221212 is a wasteful number, since it uses less digits than its factorization.

101123221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73924 (or 73919 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 101123221212 its reverse (212122321101), we get a palindrome (313245542313).

The spelling of 101123221212 in words is "one hundred one billion, one hundred twenty-three million, two hundred twenty-one thousand, two hundred twelve".