121211111020020 has 192 divisors, whose sum is σ = 388218169253376. Its totient is φ = 27680934297600.

The previous prime is 121211111020003. The next prime is 121211111020093. The reversal of 121211111020020 is 20020111112121.

It is a happy number.

It is a super-2 number, since 2×121211111020020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 2617870870 + ... + 2617917170.

It is an arithmetic number, because the mean of its divisors is an integer number (2021969631528).

Almost surely, 2^{121211111020020} is an apocalyptic number.

121211111020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211111020020 is an abundant number, since it is smaller than the sum of its proper divisors (267007058233356).

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

121211111020020 is a wasteful number, since it uses less digits than its factorization.

121211111020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51690 (or 51688 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211111020020 its reverse (20020111112121), we get a palindrome (141231222132141).

The spelling of 121211111020020 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred eleven million, twenty thousand, twenty".