21200102210122 has 24 divisors (see below), whose sum is σ = 34954210706688. Its totient is φ = 9636320998920.

The previous prime is 21200102210117. The next prime is 21200102210123. The reversal of 21200102210122 is 22101220100212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21200102210096 and 21200102210105.

It is not an unprimeable number, because it can be changed into a prime (21200102210123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30771543 + ... + 31452949.

It is an arithmetic number, because the mean of its divisors is an integer number (1456425446112).

Almost surely, 2^{21200102210122} is an apocalyptic number.

21200102210122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21200102210122 is a deficient number, since it is larger than the sum of its proper divisors (13754108496566).

21200102210122 is a wasteful number, since it uses less digits than its factorization.

21200102210122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809994 (or 809983 counting only the distinct ones).

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

Adding to 21200102210122 its reverse (22101220100212), we get a palindrome (43301322310334).

The spelling of 21200102210122 in words is "twenty-one trillion, two hundred billion, one hundred two million, two hundred ten thousand, one hundred twenty-two".