1211012021010 has 192 divisors, whose sum is σ = 3364617231360. Its totient is φ = 277977744000.

The previous prime is 1211012020997. The next prime is 1211012021039. The reversal of 1211012021010 is 101202101121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 175939029 + ... + 175945911.

It is an arithmetic number, because the mean of its divisors is an integer number (17524048080).

Almost surely, 2^{1211012021010} is an apocalyptic number.

1211012021010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211012021010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1682308615680).

1211012021010 is an abundant number, since it is smaller than the sum of its proper divisors (2153605210350).

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

1211012021010 is a wasteful number, since it uses less digits than its factorization.

1211012021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9485 (or 9474 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1211012021010 its reverse (101202101121), we get a palindrome (1312214122131).

The spelling of 1211012021010 in words is "one trillion, two hundred eleven billion, twelve million, twenty-one thousand, ten".