1243222020400 has 60 divisors (see below), whose sum is σ = 3024649093600. Its totient is φ = 490994000640.

The previous prime is 1243222020379. The next prime is 1243222020413. The reversal of 1243222020400 is 40202223421.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19639635 + ... + 19702834.

Almost surely, 2^{1243222020400} is an apocalyptic number.

1243222020400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243222020400 is an abundant number, since it is smaller than the sum of its proper divisors (1781427073200).

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

1243222020400 is a wasteful number, since it uses less digits than its factorization.

1243222020400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39342566 (or 39342555 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 1243222020400 its reverse (40202223421), we get a palindrome (1283424243821).

The spelling of 1243222020400 in words is "one trillion, two hundred forty-three billion, two hundred twenty-two million, twenty thousand, four hundred".