1201621221500 has 96 divisors (see below), whose sum is σ = 2999647437696. Its totient is φ = 411929356800.

The previous prime is 1201621221491. The next prime is 1201621221557. The reversal of 1201621221500 is 51221261021.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32927264 + ... + 32963736.

It is an arithmetic number, because the mean of its divisors is an integer number (31246327476).

Almost surely, 2^{1201621221500} is an apocalyptic number.

1201621221500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201621221500 is an abundant number, since it is smaller than the sum of its proper divisors (1798026216196).

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

1201621221500 is a wasteful number, since it uses less digits than its factorization.

1201621221500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45912 (or 45900 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 1201621221500 its reverse (51221261021), we get a palindrome (1252842482521).

The spelling of 1201621221500 in words is "one trillion, two hundred one billion, six hundred twenty-one million, two hundred twenty-one thousand, five hundred".