21210200112121 has 4 divisors (see below), whose sum is σ = 21210276524544. Its totient is φ = 21210123699700.

The previous prime is 21210200112071. The next prime is 21210200112131. The reversal of 21210200112121 is 12121100201212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21210200112121 - 2¹³ = 21210200103929 is a prime.

It is a super-2 number, since 2×21210200112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210200112095 and 21210200112104.

It is not an unprimeable number, because it can be changed into a prime (21210200112131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37788325 + ... + 38345506.

It is an arithmetic number, because the mean of its divisors is an integer number (5302569131136).

Almost surely, 2^{21210200112121} is an apocalyptic number.

It is an amenable number.

21210200112121 is a deficient number, since it is larger than the sum of its proper divisors (76412423).

21210200112121 is an equidigital number, since it uses as much as digits as its factorization.

21210200112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76412422.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210200112121 its reverse (12121100201212), we get a palindrome (33331300313333).

The spelling of 21210200112121 in words is "twenty-one trillion, two hundred ten billion, two hundred million, one hundred twelve thousand, one hundred twenty-one".