20121230231021 has 4 divisors (see below), whose sum is σ = 20121363787872. Its totient is φ = 20121096674172.

The previous prime is 20121230230993. The next prime is 20121230231033. The reversal of 20121230231021 is 12013203212102.

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 20121230231021 - 2³⁸ = 19846352324077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121230230984 and 20121230231002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121230291021) 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, 66552185 + ... + 66853838.

It is an arithmetic number, because the mean of its divisors is an integer number (5030340946968).

Almost surely, 2^{20121230231021} is an apocalyptic number.

It is an amenable number.

20121230231021 is a deficient number, since it is larger than the sum of its proper divisors (133556851).

20121230231021 is a wasteful number, since it uses less digits than its factorization.

20121230231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133556850.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20121230231021 its reverse (12013203212102), we get a palindrome (32134433443123).

The spelling of 20121230231021 in words is "twenty trillion, one hundred twenty-one billion, two hundred thirty million, two hundred thirty-one thousand, twenty-one".