21121020102102 has 16 divisors (see below), whose sum is σ = 42934532667312. Its totient is φ = 6924924623520.

The previous prime is 21121020102097. The next prime is 21121020102157. The reversal of 21121020102102 is 20120102012112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28853852233 + ... + 28853852964.

It is an arithmetic number, because the mean of its divisors is an integer number (2683408291707).

Almost surely, 2^{21121020102102} is an apocalyptic number.

21121020102102 is an abundant number, since it is smaller than the sum of its proper divisors (21813512565210).

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

21121020102102 is a wasteful number, since it uses less digits than its factorization.

21121020102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57707705263.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21121020102102 its reverse (20120102012112), we get a palindrome (41241122114214).

The spelling of 21121020102102 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, one hundred two thousand, one hundred two".