21221002010121 has 32 divisors (see below), whose sum is σ = 29094954537600. Its totient is φ = 13749823787520.

The previous prime is 21221002010083. The next prime is 21221002010177. The reversal of 21221002010121 is 12101020012212.

It is not a de Polignac number, because 21221002010121 - 2¹³ = 21221002001929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221002010121.

It is not an unprimeable number, because it can be changed into a prime (21221002030121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 604448850 + ... + 604483956.

It is an arithmetic number, because the mean of its divisors is an integer number (909217329300).

Almost surely, 2^{21221002010121} is an apocalyptic number.

It is an amenable number.

21221002010121 is a deficient number, since it is larger than the sum of its proper divisors (7873952527479).

21221002010121 is a wasteful number, since it uses less digits than its factorization.

21221002010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53689.

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

Adding to 21221002010121 its reverse (12101020012212), we get a palindrome (33322022022333).

The spelling of 21221002010121 in words is "twenty-one trillion, two hundred twenty-one billion, two million, ten thousand, one hundred twenty-one".