21212231121102 has 32 divisors (see below), whose sum is σ = 49029876115200. Its totient is φ = 5992540411968.

The previous prime is 21212231121077. The next prime is 21212231121121. The reversal of 21212231121102 is 20112113221212.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 2837373352 + ... + 2837380827.

It is an arithmetic number, because the mean of its divisors is an integer number (1532183628600).

Almost surely, 2^{21212231121102} is an apocalyptic number.

21212231121102 is an abundant number, since it is smaller than the sum of its proper divisors (27817644994098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212231121102 is a wasteful number, since it uses less digits than its factorization.

21212231121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5674754280.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21212231121102 its reverse (20112113221212), we get a palindrome (41324344342314).

The spelling of 21212231121102 in words is "twenty-one trillion, two hundred twelve billion, two hundred thirty-one million, one hundred twenty-one thousand, one hundred two".