12121213230021 has 64 divisors (see below), whose sum is σ = 18732366766080. Its totient is φ = 6828890664960.

The previous prime is 12121213229959. The next prime is 12121213230041. The reversal of 12121213230021 is 12003231212121.

12121213230021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12121213230021 - 2¹⁰ = 12121213228997 is a prime.

It is a super-2 number, since 2×12121213230021² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 12121213230021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121213230041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 525558136 + ... + 525581198.

It is an arithmetic number, because the mean of its divisors is an integer number (292693230720).

Almost surely, 2^{12121213230021} is an apocalyptic number.

It is an amenable number.

12121213230021 is a deficient number, since it is larger than the sum of its proper divisors (6611153536059).

12121213230021 is a wasteful number, since it uses less digits than its factorization.

12121213230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24346.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 12121213230021 its reverse (12003231212121), we get a palindrome (24124444442142).

The spelling of 12121213230021 in words is "twelve trillion, one hundred twenty-one billion, two hundred thirteen million, two hundred thirty thousand, twenty-one".