21121211102102 has 8 divisors (see below), whose sum is σ = 31681838827056. Its totient is φ = 10560598159752.

The previous prime is 21121211102087. The next prime is 21121211102107. The reversal of 21121211102102 is 20120111212112.

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

It is a super-2 number, since 2×21121211102102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121211102107) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1143743 + ... + 6599285.

It is an arithmetic number, because the mean of its divisors is an integer number (3960229853382).

Almost surely, 2^{21121211102102} is an apocalyptic number.

21121211102102 is a deficient number, since it is larger than the sum of its proper divisors (10560627724954).

21121211102102 is a wasteful number, since it uses less digits than its factorization.

21121211102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7391302.

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

Adding to 21121211102102 its reverse (20120111212112), we get a palindrome (41241322314214).

The spelling of 21121211102102 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, one hundred two thousand, one hundred two".