121212020 has 24 divisors (see below), whose sum is σ = 267943200. Its totient is φ = 45932832.

The previous prime is 121212017. The next prime is 121212071. The reversal of 121212020 is 20212121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121211992 and 121212010.

It is a congruent number.

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, 159110 + ... + 159869.

It is an arithmetic number, because the mean of its divisors is an integer number (11164300).

Almost surely, 2^121212020 is an apocalyptic number.

121212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212020 is an abundant number, since it is smaller than the sum of its proper divisors (146731180).

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

121212020 is a wasteful number, since it uses less digits than its factorization.

121212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319007 (or 319005 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121212020 is about 11009.6330547389. The cubic root of 121212020 is about 494.8974654134.

Adding to 121212020 its reverse (20212121), we get a palindrome (141424141).

It can be divided in two parts, 12121 and 2020, that added together give a palindrome (14141).

The spelling of 121212020 in words is "one hundred twenty-one million, two hundred twelve thousand, twenty".