121110100020 has 480 divisors, whose sum is σ = 482704459776. Its totient is φ = 24727680000.

The previous prime is 121110099977. The next prime is 121110100057. The reversal of 121110100020 is 20001011121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121110099975 and 121110100011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 4556770 + ... + 4583270.

Almost surely, 2^121110100020 is an apocalyptic number.

121110100020 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 121110100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241352229888).

121110100020 is an abundant number, since it is smaller than the sum of its proper divisors (361594359756).

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

121110100020 is a wasteful number, since it uses less digits than its factorization.

121110100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26573 (or 26562 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121110100020 its reverse (20001011121), we get a palindrome (141111111141).

The spelling of 121110100020 in words is "one hundred twenty-one billion, one hundred ten million, one hundred thousand, twenty".