121101221100020 has 96 divisors (see below), whose sum is σ = 292236849983232. Its totient is φ = 41292887021568.

The previous prime is 121101221099923. The next prime is 121101221100029. The reversal of 121101221100020 is 20001122101121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 121101221099968 and 121101221100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101221100029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67149932 + ... + 68929788.

It is an arithmetic number, because the mean of its divisors is an integer number (3044133853992).

Almost surely, 2^{121101221100020} is an apocalyptic number.

121101221100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121101221100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146118424991616).

121101221100020 is an abundant number, since it is smaller than the sum of its proper divisors (171135628883212).

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

121101221100020 is a wasteful number, since it uses less digits than its factorization.

121101221100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782537 (or 1782535 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121101221100020 its reverse (20001122101121), we get a palindrome (141102343201141).

The spelling of 121101221100020 in words is "one hundred twenty-one trillion, one hundred one billion, two hundred twenty-one million, one hundred thousand, twenty".