121210121010020 has 72 divisors (see below), whose sum is σ = 299030683505400. Its totient is φ = 41146292812800.

The previous prime is 121210121010007. The next prime is 121210121010049. The reversal of 121210121010020 is 20010121012121.

It can be written as a sum of positive squares in 4 ways, for example, as 33285330190336 + 87924790819684 = 5769344^2 + 9376822^2 .

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 121210121009977 and 121210121010004.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 612197045 + ... + 612395004.

It is an arithmetic number, because the mean of its divisors is an integer number (4153203937575).

Almost surely, 2^{121210121010020} is an apocalyptic number.

121210121010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210121010020 is an abundant number, since it is smaller than the sum of its proper divisors (177820562495380).

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

121210121010020 is a wasteful number, since it uses less digits than its factorization.

121210121010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224592173 (or 1224592164 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121210121010020 its reverse (20010121012121), we get a palindrome (141220242022141).

The spelling of 121210121010020 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred twenty-one million, ten thousand, twenty".