21021020212102 has 8 divisors (see below), whose sum is σ = 31548383092512. Its totient is φ = 10504892514600.

The previous prime is 21021020212097. The next prime is 21021020212109. The reversal of 21021020212102 is 20121202012012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021020212109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2808791049 + ... + 2808798532.

It is an arithmetic number, because the mean of its divisors is an integer number (3943547886564).

Almost surely, 2^{21021020212102} is an apocalyptic number.

21021020212102 is a deficient number, since it is larger than the sum of its proper divisors (10527362880410).

21021020212102 is a wasteful number, since it uses less digits than its factorization.

21021020212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617591454.

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

Adding to 21021020212102 its reverse (20121202012012), we get a palindrome (41142222224114).

The spelling of 21021020212102 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred twelve thousand, one hundred two".