121201010020 has 48 divisors (see below), whose sum is σ = 260726336640. Its totient is φ = 47301117696.

The previous prime is 121201010003. The next prime is 121201010027. The reversal of 121201010020 is 20010102121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121201009979 and 121201010006.

It is not an unprimeable number, because it can be changed into a prime (121201010027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 713664 + ... + 867016.

It is an arithmetic number, because the mean of its divisors is an integer number (5431798680).

Almost surely, 2^121201010020 is an apocalyptic number.

121201010020 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 121201010020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130363168320).

121201010020 is an abundant number, since it is smaller than the sum of its proper divisors (139525326620).

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

121201010020 is a wasteful number, since it uses less digits than its factorization.

121201010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154324 (or 154322 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121201010020 its reverse (20010102121), we get a palindrome (141211112141).

The spelling of 121201010020 in words is "one hundred twenty-one billion, two hundred one million, ten thousand, twenty".