20211221210102 has 32 divisors (see below), whose sum is σ = 33224920509312. Its totient is φ = 9164671893504.

The previous prime is 20211221210099. The next prime is 20211221210119. The reversal of 20211221210102 is 20101212211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20229518 + ... + 21205089.

It is an arithmetic number, because the mean of its divisors is an integer number (1038278765916).

Almost surely, 2^{20211221210102} is an apocalyptic number.

20211221210102 is a deficient number, since it is larger than the sum of its proper divisors (13013699299210).

20211221210102 is a wasteful number, since it uses less digits than its factorization.

20211221210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41434952.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20211221210102 its reverse (20101212211202), we get a palindrome (40312433421304).

The spelling of 20211221210102 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, one hundred two".