21021220021202 has 16 divisors (see below), whose sum is σ = 32379144732312. Its totient is φ = 10231724459520.

The previous prime is 21021220021201. The next prime is 21021220021229. The reversal of 21021220021202 is 20212002212012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15305864377441 + 5715355643761 = 3912271^2 + 2390681^2 .

It is not an unprimeable number, because it can be changed into a prime (21021220021201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 888158693 + ... + 888182360.

Almost surely, 2^{21021220021202} is an apocalyptic number.

21021220021202 is a deficient number, since it is larger than the sum of its proper divisors (11357924711110).

21021220021202 is a wasteful number, since it uses less digits than its factorization.

21021220021202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776341213.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21021220021202 its reverse (20212002212012), we get a palindrome (41233222233214).

The spelling of 21021220021202 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, twenty-one thousand, two hundred two".