21121211210102 has 16 divisors (see below), whose sum is σ = 33059632280832. Its totient is φ = 10101343371240.

The previous prime is 21121211210069. The next prime is 21121211210117. The reversal of 21121211210102 is 20101211212112.

It is a super-2 number, since 2×21121211210102² (a number of 27 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 2149343 + ... + 6845589.

It is an arithmetic number, because the mean of its divisors is an integer number (2066227017552).

Almost surely, 2^{21121211210102} is an apocalyptic number.

21121211210102 is a deficient number, since it is larger than the sum of its proper divisors (11938421070730).

21121211210102 is a wasteful number, since it uses less digits than its factorization.

21121211210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4794043.

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

Adding to 21121211210102 its reverse (20101211212112), we get a palindrome (41222422422214).

The spelling of 21121211210102 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred two".