21010002221121 has 8 divisors (see below), whose sum is σ = 28013507121984. Its totient is φ = 14006582733840.

The previous prime is 21010002221057. The next prime is 21010002221147. The reversal of 21010002221121 is 12112220001012.

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

It is not a de Polignac number, because 21010002221121 - 2⁶ = 21010002221057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010002221121.

It is not an unprimeable number, because it can be changed into a prime (21010002220121) 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 7 ways as a sum of consecutive naturals, for example, 20777221 + ... + 21764946.

It is an arithmetic number, because the mean of its divisors is an integer number (3501688390248).

Almost surely, 2^{21010002221121} is an apocalyptic number.

It is an amenable number.

21010002221121 is a deficient number, since it is larger than the sum of its proper divisors (7003504900863).

21010002221121 is a wasteful number, since it uses less digits than its factorization.

21010002221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42706791.

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

Adding to 21010002221121 its reverse (12112220001012), we get a palindrome (33122222222133).

The spelling of 21010002221121 in words is "twenty-one trillion, ten billion, two million, two hundred twenty-one thousand, one hundred twenty-one".