210121030020 has 96 divisors (see below), whose sum is σ = 675604500480. Its totient is φ = 48257458560.

The previous prime is 210121030019. The next prime is 210121030043. The reversal of 210121030020 is 20030121012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 210121029978 and 210121030005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8365492 + ... + 8390571.

It is an arithmetic number, because the mean of its divisors is an integer number (7037546880).

Almost surely, 2^210121030020 is an apocalyptic number.

210121030020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121030020 is an abundant number, since it is smaller than the sum of its proper divisors (465483470460).

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

210121030020 is a wasteful number, since it uses less digits than its factorization.

210121030020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16756105 (or 16756103 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 210121030020 its reverse (20030121012), we get a palindrome (230151151032).

The spelling of 210121030020 in words is "two hundred ten billion, one hundred twenty-one million, thirty thousand, twenty".