121201100020 has 96 divisors (see below), whose sum is σ = 341736304896. Its totient is φ = 34871040000.

The previous prime is 121201099979. The next prime is 121201100021. The reversal of 121201100020 is 20001102121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201100021) 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, 3006981 + ... + 3047020.

It is an arithmetic number, because the mean of its divisors is an integer number (3559753176).

Almost surely, 2^121201100020 is an apocalyptic number.

121201100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201100020 is an abundant number, since it is smaller than the sum of its proper divisors (220535204876).

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

121201100020 is a wasteful number, since it uses less digits than its factorization.

121201100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054041 (or 6054039 counting only the distinct ones).

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

Adding to 121201100020 its reverse (20001102121), we get a palindrome (141202202141).

The spelling of 121201100020 in words is "one hundred twenty-one billion, two hundred one million, one hundred thousand, twenty".