1211021420004 has 144 divisors (see below), whose sum is σ = 3416717566080. Its totient is φ = 358568640000.

The previous prime is 1211021419999. The next prime is 1211021420039. The reversal of 1211021420004 is 4000241201121.

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

It is an unprimeable number.

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, 3481552 + ... + 3813560.

It is an arithmetic number, because the mean of its divisors is an integer number (23727205320).

Almost surely, 2^{1211021420004} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211021420004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1708358783040).

1211021420004 is an abundant number, since it is smaller than the sum of its proper divisors (2205696146076).

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

1211021420004 is a wasteful number, since it uses less digits than its factorization.

1211021420004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332242 (or 332237 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1211021420004 its reverse (4000241201121), we get a palindrome (5211262621125).

The spelling of 1211021420004 in words is "one trillion, two hundred eleven billion, twenty-one million, four hundred twenty thousand, four".