21000002211121 has 16 divisors (see below), whose sum is σ = 23065945136640. Its totient is φ = 19038557790720.

The previous prime is 21000002211109. The next prime is 21000002211151. The reversal of 21000002211121 is 12111220000012.

It is not a de Polignac number, because 21000002211121 - 2⁹ = 21000002210609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000002211151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190635621 + ... + 190745746.

It is an arithmetic number, because the mean of its divisors is an integer number (1441621571040).

Almost surely, 2^{21000002211121} is an apocalyptic number.

It is an amenable number.

21000002211121 is a deficient number, since it is larger than the sum of its proper divisors (2065942925519).

21000002211121 is a wasteful number, since it uses less digits than its factorization.

21000002211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381381504.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000002211121 its reverse (12111220000012), we get a palindrome (33111222211133).

The spelling of 21000002211121 in words is "twenty-one trillion, two million, two hundred eleven thousand, one hundred twenty-one".