210121102020020 has 12 divisors (see below), whose sum is σ = 441254314242084. Its totient is φ = 84048440808000.

The previous prime is 210121102020013. The next prime is 210121102020047. The reversal of 210121102020020 is 20020201121012.

It can be written as a sum of positive squares in 2 ways, for example, as 29666693397796 + 180454408622224 = 5446714^2 + 13433332^2 .

It is a junction number, because it is equal to n+sod(n) for n = 210121102019977 and 210121102020004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5253027550481 + ... + 5253027550520.

It is an arithmetic number, because the mean of its divisors is an integer number (36771192853507).

Almost surely, 2^{210121102020020} is an apocalyptic number.

210121102020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121102020020 is an abundant number, since it is smaller than the sum of its proper divisors (231133212222064).

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

210121102020020 is a wasteful number, since it uses less digits than its factorization.

210121102020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506055101010 (or 10506055101008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210121102020020 its reverse (20020201121012), we get a palindrome (230141303141032).

The spelling of 210121102020020 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred two million, twenty thousand, twenty".