210121021211020 has 24 divisors (see below), whose sum is σ = 455488149207168. Its totient is φ = 81337169500800.

The previous prime is 210121021210999. The next prime is 210121021211021. The reversal of 210121021211020 is 20112120121012.

It is a junction number, because it is equal to n+sod(n) for n = 210121021210985 and 210121021211003.

It is not an unprimeable number, because it can be changed into a prime (210121021211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169452435841 + ... + 169452437080.

It is an arithmetic number, because the mean of its divisors is an integer number (18978672883632).

Almost surely, 2^{210121021211020} is an apocalyptic number.

210121021211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121021211020 is an abundant number, since it is smaller than the sum of its proper divisors (245367127996148).

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

210121021211020 is a wasteful number, since it uses less digits than its factorization.

210121021211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338904872961 (or 338904872959 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210121021211020 its reverse (20112120121012), we get a palindrome (230233141332032).

The spelling of 210121021211020 in words is "two hundred ten trillion, one hundred twenty-one billion, twenty-one million, two hundred eleven thousand, twenty".