121210101221020 has 96 divisors (see below), whose sum is σ = 298166066835840. Its totient is φ = 40521478901760.

The previous prime is 121210101220987. The next prime is 121210101221023. The reversal of 121210101221020 is 20122101012121.

It is a junction number, because it is equal to n+sod(n) for n = 121210101220985 and 121210101221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210101221023) 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, 4367032 + ... + 16170688.

It is an arithmetic number, because the mean of its divisors is an integer number (3105896529540).

Almost surely, 2^{121210101221020} is an apocalyptic number.

121210101221020 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 121210101221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149083033417920).

121210101221020 is an abundant number, since it is smaller than the sum of its proper divisors (176955965614820).

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

121210101221020 is a wasteful number, since it uses less digits than its factorization.

121210101221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11805503 (or 11805501 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121210101221020 its reverse (20122101012121), we get a palindrome (141332202233141).

The spelling of 121210101221020 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred one million, two hundred twenty-one thousand, twenty".