21202111010121 has 8 divisors (see below), whose sum is σ = 28271015054880. Its totient is φ = 14133973819392.

The previous prime is 21202111010107. The next prime is 21202111010141. The reversal of 21202111010121 is 12101011120212.

It is a happy number.

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

It is not a de Polignac number, because 21202111010121 - 2²⁶ = 21202043901257 is a prime.

It is a super-2 number, since 2×21202111010121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202111010121.

It is not an unprimeable number, because it can be changed into a prime (21202111010141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191648991 + ... + 191759588.

It is an arithmetic number, because the mean of its divisors is an integer number (3533876881860).

Almost surely, 2^{21202111010121} is an apocalyptic number.

It is an amenable number.

21202111010121 is a deficient number, since it is larger than the sum of its proper divisors (7068904044759).

21202111010121 is a wasteful number, since it uses less digits than its factorization.

21202111010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383427015.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21202111010121 its reverse (12101011120212), we get a palindrome (33303122130333).

The spelling of 21202111010121 in words is "twenty-one trillion, two hundred two billion, one hundred eleven million, ten thousand, one hundred twenty-one".