1211010221112 has 128 divisors (see below), whose sum is σ = 3169249977600. Its totient is φ = 385224173568.

The previous prime is 1211010221087. The next prime is 1211010221119. The reversal of 1211010221112 is 2111220101121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211010221091 and 1211010221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211010221119) 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, 23183568 + ... + 23235744.

It is an arithmetic number, because the mean of its divisors is an integer number (24759765450).

Almost surely, 2^{1211010221112} is an apocalyptic number.

1211010221112 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 1211010221112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1584624988800).

1211010221112 is an abundant number, since it is smaller than the sum of its proper divisors (1958239756488).

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

1211010221112 is a wasteful number, since it uses less digits than its factorization.

1211010221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52725 (or 52721 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211010221112 its reverse (2111220101121), we get a palindrome (3322230322233).

The spelling of 1211010221112 in words is "one trillion, two hundred eleven billion, ten million, two hundred twenty-one thousand, one hundred twelve".