21221010010202 has 16 divisors (see below), whose sum is σ = 32271762961512. Its totient is φ = 10464573235200.

The previous prime is 21221010010147. The next prime is 21221010010273. The reversal of 21221010010202 is 20201001012212.

It can be written as a sum of positive squares in 4 ways, for example, as 18239382436081 + 2981627574121 = 4270759^2 + 1726739^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204334283 + ... + 204438110.

Almost surely, 2^{21221010010202} is an apocalyptic number.

21221010010202 is a deficient number, since it is larger than the sum of its proper divisors (11050752951310).

21221010010202 is a wasteful number, since it uses less digits than its factorization.

21221010010202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408772753.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221010010202 its reverse (20201001012212), we get a palindrome (41422011022414).

The spelling of 21221010010202 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, ten thousand, two hundred two".