21000221210202 has 128 divisors (see below), whose sum is σ = 46848741907968. Its totient is φ = 6234418176000.

The previous prime is 21000221210173. The next prime is 21000221210249. The reversal of 21000221210202 is 20201212200012.

21000221210202 is a modest number, since divided by 21210202 gives 210002 as remainder.

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, 105111202 + ... + 105310802.

It is an arithmetic number, because the mean of its divisors is an integer number (366005796156).

Almost surely, 2^{21000221210202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000221210202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23424370953984).

21000221210202 is an abundant number, since it is smaller than the sum of its proper divisors (25848520697766).

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

21000221210202 is a wasteful number, since it uses less digits than its factorization.

21000221210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200024.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21000221210202 its reverse (20201212200012), we get a palindrome (41201433410214).

The spelling of 21000221210202 in words is "twenty-one trillion, two hundred twenty-one million, two hundred ten thousand, two hundred two".