21102121010202 has 8 divisors (see below), whose sum is σ = 42204242020416. Its totient is φ = 7034040336732.

The previous prime is 21102121010197. The next prime is 21102121010251. The reversal of 21102121010202 is 20201012120112.

It is a sphenic number, since it is the product of 3 distinct primes.

21102121010202 is an admirable number.

It is a super-2 number, since 2×21102121010202² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1758510084178 + ... + 1758510084189.

It is an arithmetic number, because the mean of its divisors is an integer number (5275530252552).

Almost surely, 2^{21102121010202} is an apocalyptic number.

21102121010202 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21102121010202 is a wasteful number, since it uses less digits than its factorization.

21102121010202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517020168372.

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

Adding to 21102121010202 its reverse (20201012120112), we get a palindrome (41303133130314).

The spelling of 21102121010202 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, ten thousand, two hundred two".