21020202101010 has 128 divisors (see below), whose sum is σ = 61084583115264. Its totient is φ = 4519202181120.

The previous prime is 21020202100999. The next prime is 21020202101071. The reversal of 21020202101010 is 1010120202012.

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, 3970804 + ... + 7603136.

It is an arithmetic number, because the mean of its divisors is an integer number (477223305588).

Almost surely, 2^{21020202101010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020202101010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30542291557632).

21020202101010 is an abundant number, since it is smaller than the sum of its proper divisors (40064381014254).

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

21020202101010 is a wasteful number, since it uses less digits than its factorization.

21020202101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633988.

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

Adding to 21020202101010 its reverse (1010120202012), we get a palindrome (22030322303022).

The spelling of 21020202101010 in words is "twenty-one trillion, twenty billion, two hundred two million, one hundred one thousand, ten".