1221411003252 has 144 divisors (see below), whose sum is σ = 3227458523520. Its totient is φ = 358980145920.

The previous prime is 1221411003251. The next prime is 1221411003269. The reversal of 1221411003252 is 2523001141221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221411003251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16994649 + ... + 17066367.

Almost surely, 2^{1221411003252} is an apocalyptic number.

1221411003252 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 1221411003252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1613729261760).

1221411003252 is an abundant number, since it is smaller than the sum of its proper divisors (2006047520268).

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

1221411003252 is a wasteful number, since it uses less digits than its factorization.

1221411003252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72102 (or 72089 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 1221411003252 its reverse (2523001141221), we get a palindrome (3744412144473).

The spelling of 1221411003252 in words is "one trillion, two hundred twenty-one billion, four hundred eleven million, three thousand, two hundred fifty-two".