100121221201020 has 96 divisors (see below), whose sum is σ = 296834826657600. Its totient is φ = 25128052506624.

The previous prime is 100121221200991. The next prime is 100121221201033. The reversal of 100121221201020 is 20102122121001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64192176 + ... + 65733384.

It is an arithmetic number, because the mean of its divisors is an integer number (3092029444350).

Almost surely, 2^{100121221201020} is an apocalyptic number.

100121221201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121221201020 is an abundant number, since it is smaller than the sum of its proper divisors (196713605456580).

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

100121221201020 is a wasteful number, since it uses less digits than its factorization.

100121221201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604927 (or 1604925 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 100121221201020 its reverse (20102122121001), we get a palindrome (120223343322021).

The spelling of 100121221201020 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, twenty".