121211012012020 has 192 divisors, whose sum is σ = 302117052142080. Its totient is φ = 39967885375488.

The previous prime is 121211012011939. The next prime is 121211012012039. The reversal of 121211012012020 is 20210210112121.

It is a junction number, because it is equal to n+sod(n) for n = 121211012011985 and 121211012012003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3213678202 + ... + 3213715918.

It is an arithmetic number, because the mean of its divisors is an integer number (1573526313240).

Almost surely, 2^{121211012012020} is an apocalyptic number.

121211012012020 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 121211012012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151058526071040).

121211012012020 is an abundant number, since it is smaller than the sum of its proper divisors (180906040130060).

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

121211012012020 is a wasteful number, since it uses less digits than its factorization.

121211012012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40842 (or 40840 counting only the distinct ones).

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

Adding to 121211012012020 its reverse (20210210112121), we get a palindrome (141421222124141).

The spelling of 121211012012020 in words is "one hundred twenty-one trillion, two hundred eleven billion, twelve million, twelve thousand, twenty".