21221002130121 has 24 divisors (see below), whose sum is σ = 32136867637056. Its totient is φ = 13468099407840.

The previous prime is 21221002130039. The next prime is 21221002130129. The reversal of 21221002130121 is 12103120012212.

It is not a de Polignac number, because 21221002130121 - 2⁹ = 21221002129609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221002130094 and 21221002130103.

It is not an unprimeable number, because it can be changed into a prime (21221002130129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242887410 + ... + 242974763.

It is an arithmetic number, because the mean of its divisors is an integer number (1339036151544).

Almost surely, 2^{21221002130121} is an apocalyptic number.

It is an amenable number.

21221002130121 is a deficient number, since it is larger than the sum of its proper divisors (10915865506935).

21221002130121 is a wasteful number, since it uses less digits than its factorization.

21221002130121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485862413 (or 485862410 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21221002130121 its reverse (12103120012212), we get a palindrome (33324122142333).

The spelling of 21221002130121 in words is "twenty-one trillion, two hundred twenty-one billion, two million, one hundred thirty thousand, one hundred twenty-one".