1213453221400 has 96 divisors (see below), whose sum is σ = 3285154959840. Its totient is φ = 408191247360.

The previous prime is 1213453221389. The next prime is 1213453221401. The reversal of 1213453221400 is 41223543121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213453221401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8102709 + ... + 8251108.

It is an arithmetic number, because the mean of its divisors is an integer number (34220364165).

Almost surely, 2^{1213453221400} is an apocalyptic number.

1213453221400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213453221400 is an abundant number, since it is smaller than the sum of its proper divisors (2071701738440).

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

1213453221400 is a wasteful number, since it uses less digits than its factorization.

1213453221400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16353893 (or 16353884 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 1213453221400 its reverse (41223543121), we get a palindrome (1254676764521).

The spelling of 1213453221400 in words is "one trillion, two hundred thirteen billion, four hundred fifty-three million, two hundred twenty-one thousand, four hundred".