20201221210102 has 32 divisors (see below), whose sum is σ = 32240898910080. Its totient is φ = 9460067863680.

The previous prime is 20201221210097. The next prime is 20201221210109. The reversal of 20201221210102 is 20101212210202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201221210109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51594073 + ... + 51984139.

It is an arithmetic number, because the mean of its divisors is an integer number (1007528090940).

Almost surely, 2^{20201221210102} is an apocalyptic number.

20201221210102 is a deficient number, since it is larger than the sum of its proper divisors (12039677699978).

20201221210102 is a wasteful number, since it uses less digits than its factorization.

20201221210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397516.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20201221210102 its reverse (20101212210202), we get a palindrome (40302433420304).

The spelling of 20201221210102 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, two hundred ten thousand, one hundred two".