121212202120 has 16 divisors (see below), whose sum is σ = 272727454860. Its totient is φ = 48484880832.

The previous prime is 121212202117. The next prime is 121212202127. The reversal of 121212202120 is 21202212121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 120590896644 + 621305476 = 347262^2 + 24926^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121212202094 and 121212202103.

It is not an unprimeable number, because it can be changed into a prime (121212202127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515152487 + ... + 1515152566.

Almost surely, 2^121212202120 is an apocalyptic number.

121212202120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212202120 is an abundant number, since it is smaller than the sum of its proper divisors (151515252740).

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

121212202120 is a wasteful number, since it uses less digits than its factorization.

121212202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030305064 (or 3030305060 counting only the distinct ones).

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

Adding to 121212202120 its reverse (21202212121), we get a palindrome (142414414241).

The spelling of 121212202120 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred two thousand, one hundred twenty".