21002102122102 has 32 divisors (see below), whose sum is σ = 34245389122560. Its totient is φ = 9633403010880.

The previous prime is 21002102122097. The next prime is 21002102122103. The reversal of 21002102122102 is 20122120120012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002102122103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94259838 + ... + 94482385.

It is an arithmetic number, because the mean of its divisors is an integer number (1070168410080).

Almost surely, 2^{21002102122102} is an apocalyptic number.

21002102122102 is a deficient number, since it is larger than the sum of its proper divisors (13243287000458).

21002102122102 is a wasteful number, since it uses less digits than its factorization.

21002102122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188742348.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002102122102 its reverse (20122120120012), we get a palindrome (41124222242114).

The spelling of 21002102122102 in words is "twenty-one trillion, two billion, one hundred two million, one hundred twenty-two thousand, one hundred two".