210121021220013 has 12 divisors (see below), whose sum is σ = 303745814560188. Its totient is φ = 139970985675840.

The previous prime is 210121021219931. The next prime is 210121021220059. The reversal of 210121021220013 is 310022120121012.

210121021220013 is a `hidden beast` number, since 210 + 1 + 210 + 21 + 220 + 0 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 134773013835684 + 75348007384329 = 11609178^2 + 8680323^2 .

It is not a de Polignac number, because 210121021220013 - 2¹⁶ = 210121021154477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121021220113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9141249328 + ... + 9141272313.

It is an arithmetic number, because the mean of its divisors is an integer number (25312151213349).

Almost surely, 2^{210121021220013} is an apocalyptic number.

It is an amenable number.

210121021220013 is a deficient number, since it is larger than the sum of its proper divisors (93624793340175).

210121021220013 is a wasteful number, since it uses less digits than its factorization.

210121021220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18282522924 (or 18282522921 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 210121021220013 its reverse (310022120121012), we get a palindrome (520143141341025).

The spelling of 210121021220013 in words is "two hundred ten trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty thousand, thirteen".