21020001120210 has 128 divisors (see below), whose sum is σ = 53624797079040. Its totient is φ = 5273203089408.

The previous prime is 21020001120197. The next prime is 21020001120247. The reversal of 21020001120210 is 1202110002012.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 334986099 + ... + 335048841.

It is an arithmetic number, because the mean of its divisors is an integer number (418943727180).

Almost surely, 2^{21020001120210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020001120210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26812398539520).

21020001120210 is an abundant number, since it is smaller than the sum of its proper divisors (32604795958830).

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

21020001120210 is a wasteful number, since it uses less digits than its factorization.

21020001120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65077 (or 65043 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020001120210 its reverse (1202110002012), we get a palindrome (22222111122222).

The spelling of 21020001120210 in words is "twenty-one trillion, twenty billion, one million, one hundred twenty thousand, two hundred ten".