21021121121102 has 12 divisors (see below), whose sum is σ = 32962230568680. Its totient is φ = 10053579666108.

The previous prime is 21021121121081. The next prime is 21021121121149. The reversal of 21021121121102 is 20112112112012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9934366202 + ... + 9934368317.

It is an arithmetic number, because the mean of its divisors is an integer number (2746852547390).

Almost surely, 2^{21021121121102} is an apocalyptic number.

21021121121102 is a deficient number, since it is larger than the sum of its proper divisors (11941109447578).

21021121121102 is a wasteful number, since it uses less digits than its factorization.

21021121121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19868734567 (or 19868734544 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21021121121102 its reverse (20112112112012), we get a palindrome (41133233233114).

The spelling of 21021121121102 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred two".