121212202020 has 768 divisors, whose sum is σ = 471562076160. Its totient is φ = 22532235264.

The previous prime is 121212201967. The next prime is 121212202037. The reversal of 121212202020 is 20202212121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 88282054 + ... + 88283426.

It is an arithmetic number, because the mean of its divisors is an integer number (614013120).

Almost surely, 2^121212202020 is an apocalyptic number.

121212202020 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 121212202020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235781038080).

121212202020 is an abundant number, since it is smaller than the sum of its proper divisors (350349874140).

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

121212202020 is a wasteful number, since it uses less digits than its factorization.

121212202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 121212202020 its reverse (20202212121), we get a palindrome (141414414141).

The spelling of 121212202020 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred two thousand, twenty".