21102212121211 has 8 divisors (see below), whose sum is σ = 22946094735200. Its totient is φ = 19289848868352.

The previous prime is 21102212121149. The next prime is 21102212121269. The reversal of 21102212121211 is 11212121220112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21102212121211 - 2⁷ = 21102212121083 is a prime.

It is a super-2 number, since 2×21102212121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21102212121911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7879838886 + ... + 7879841563.

It is an arithmetic number, because the mean of its divisors is an integer number (2868261841900).

Almost surely, 2^{21102212121211} is an apocalyptic number.

21102212121211 is a deficient number, since it is larger than the sum of its proper divisors (1843882613989).

21102212121211 is a wasteful number, since it uses less digits than its factorization.

21102212121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15759680565.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21102212121211 its reverse (11212121220112), we get a palindrome (32314333341323).

The spelling of 21102212121211 in words is "twenty-one trillion, one hundred two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".