1211403004220 has 48 divisors (see below), whose sum is σ = 2551635172800. Its totient is φ = 483097096704.

The previous prime is 1211403004211. The next prime is 1211403004241. The reversal of 1211403004220 is 224003041121.

It is a super-3 number, since 3×1211403004220³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1211403004192 and 1211403004201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71515592 + ... + 71532528.

It is an arithmetic number, because the mean of its divisors is an integer number (53159066100).

Almost surely, 2^{1211403004220} is an apocalyptic number.

1211403004220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211403004220 is an abundant number, since it is smaller than the sum of its proper divisors (1340232168580).

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

1211403004220 is a wasteful number, since it uses less digits than its factorization.

1211403004220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27542 (or 27540 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1211403004220 its reverse (224003041121), we get a palindrome (1435406045341).

The spelling of 1211403004220 in words is "one trillion, two hundred eleven billion, four hundred three million, four thousand, two hundred twenty".