21210222212102 has 72 divisors (see below), whose sum is σ = 40686930067392. Its totient is φ = 8262326207520.

The previous prime is 21210222212087. The next prime is 21210222212147. The reversal of 21210222212102 is 20121222201212.

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 71438603 + ... + 71734889.

It is an arithmetic number, because the mean of its divisors is an integer number (565096250936).

Almost surely, 2^{21210222212102} is an apocalyptic number.

21210222212102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210222212102 is a deficient number, since it is larger than the sum of its proper divisors (19476707855290).

21210222212102 is a wasteful number, since it uses less digits than its factorization.

21210222212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302362 (or 302344 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21210222212102 its reverse (20121222201212), we get a palindrome (41331444413314).

The spelling of 21210222212102 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred twelve thousand, one hundred two".