121211002020 has 24 divisors (see below), whose sum is σ = 339390805824. Its totient is φ = 32322933856.

The previous prime is 121211001991. The next prime is 121211002051. The reversal of 121211002020 is 20200112121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121211001987 and 121211002005.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010091624 + ... + 1010091743.

It is an arithmetic number, because the mean of its divisors is an integer number (14141283576).

Almost surely, 2^121211002020 is an apocalyptic number.

121211002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211002020 is an abundant number, since it is smaller than the sum of its proper divisors (218179803804).

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

121211002020 is a wasteful number, since it uses less digits than its factorization.

121211002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020183379 (or 2020183377 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121211002020 its reverse (20200112121), we get a palindrome (141411114141).

The spelling of 121211002020 in words is "one hundred twenty-one billion, two hundred eleven million, two thousand, twenty".