121212021002020 has 96 divisors (see below), whose sum is σ = 275358738100320. Its totient is φ = 44553938042880.

The previous prime is 121212021001997. The next prime is 121212021002071. The reversal of 121212021002020 is 20200120212121.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 69519976082496 + 51692044919524 = 8337864^2 + 7189718^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121212021001985 and 121212021002003.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 468629130 + ... + 468887710.

It is an arithmetic number, because the mean of its divisors is an integer number (2868320188545).

Almost surely, 2^{121212021002020} is an apocalyptic number.

121212021002020 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 121212021002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137679369050160).

121212021002020 is an abundant number, since it is smaller than the sum of its proper divisors (154146717098300).

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

121212021002020 is a wasteful number, since it uses less digits than its factorization.

121212021002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266705 (or 266703 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121212021002020 its reverse (20200120212121), we get a palindrome (141412141214141).

The spelling of 121212021002020 in words is "one hundred twenty-one trillion, two hundred twelve billion, twenty-one million, two thousand, twenty".