121221111212020 has 48 divisors (see below), whose sum is σ = 255334064298768. Its totient is φ = 48341845278720.

The previous prime is 121221111211931. The next prime is 121221111212057. The reversal of 121221111212020 is 20212111122121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 19315356965776 + 101905754246244 = 4394924^2 + 10094838^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121639284 + ... + 122631796.

It is an arithmetic number, because the mean of its divisors is an integer number (5319459672891).

Almost surely, 2^{121221111212020} is an apocalyptic number.

121221111212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221111212020 is an abundant number, since it is smaller than the sum of its proper divisors (134112953086748).

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

121221111212020 is a wasteful number, since it uses less digits than its factorization.

121221111212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010980 (or 1010978 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121221111212020 its reverse (20212111122121), we get a palindrome (141433222334141).

The spelling of 121221111212020 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, twenty".