100121220220020 has 24 divisors (see below), whose sum is σ = 280339416616224. Its totient is φ = 26698992058656.

The previous prime is 100121220219997. The next prime is 100121220220117. The reversal of 100121220220020 is 20022022121001.

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 7 ways as a sum of consecutive naturals, for example, 834343501774 + ... + 834343501893.

It is an arithmetic number, because the mean of its divisors is an integer number (11680809025676).

Almost surely, 2^{100121220220020} is an apocalyptic number.

100121220220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121220220020 is an abundant number, since it is smaller than the sum of its proper divisors (180218196396204).

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

100121220220020 is a wasteful number, since it uses less digits than its factorization.

100121220220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668687003679 (or 1668687003677 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 100121220220020 its reverse (20022022121001), we get a palindrome (120143242341021).

The spelling of 100121220220020 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, twenty".