21020221210202 has 16 divisors (see below), whose sum is σ = 32547668832000. Its totient is φ = 10171003048320.

The previous prime is 21020221210201. The next prime is 21020221210207. The reversal of 21020221210202 is 20201212202012.

It is a happy number.

It is a super-3 number, since 3×21020221210202³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020221210201) 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, 8265674 + ... + 10505322.

It is an arithmetic number, because the mean of its divisors is an integer number (2034229302000).

Almost surely, 2^{21020221210202} is an apocalyptic number.

21020221210202 is a deficient number, since it is larger than the sum of its proper divisors (11527447621798).

21020221210202 is a wasteful number, since it uses less digits than its factorization.

21020221210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2391061.

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

Adding to 21020221210202 its reverse (20201212202012), we get a palindrome (41221433412214).

The spelling of 21020221210202 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred two".