1221352455000 has 160 divisors (see below), whose sum is σ = 3839815053360. Its totient is φ = 323618880000.

The previous prime is 1221352454989. The next prime is 1221352455017. The reversal of 1221352455000 is 5542531221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2095690 + ... + 2614310.

Almost surely, 2^{1221352455000} is an apocalyptic number.

1221352455000 is a gapful number since it is divisible by the number (10) 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 1221352455000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1919907526680).

1221352455000 is an abundant number, since it is smaller than the sum of its proper divisors (2618462598360).

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

1221352455000 is a wasteful number, since it uses less digits than its factorization.

1221352455000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518807 (or 518788 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 1221352455000 its reverse (5542531221), we get a palindrome (1226894986221).

The spelling of 1221352455000 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-two million, four hundred fifty-five thousand".