1221132023200 has 72 divisors (see below), whose sum is σ = 3083884767180. Its totient is φ = 471609600000.

The previous prime is 1221132023183. The next prime is 1221132023201. The reversal of 1221132023200 is 23202311221.

It can be written as a sum of positive squares in 6 ways, for example, as 294202099216 + 926929923984 = 542404^2 + 962772^2 .

It is not an unprimeable number, because it can be changed into a prime (1221132023201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26294301 + ... + 26340700.

Almost surely, 2^{1221132023200} is an apocalyptic number.

1221132023200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221132023200 is an abundant number, since it is smaller than the sum of its proper divisors (1862752743980).

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

1221132023200 is a wasteful number, since it uses less digits than its factorization.

1221132023200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52635050 (or 52635037 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 1221132023200 its reverse (23202311221), we get a palindrome (1244334334421).

The spelling of 1221132023200 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, twenty-three thousand, two hundred".