23121021412 has 6 divisors (see below), whose sum is σ = 40461787478. Its totient is φ = 11560510704.

The previous prime is 23121021401. The next prime is 23121021437. The reversal of 23121021412 is 21412012132.

It can be written as a sum of positive squares in only one way, i.e., 11888413156 + 11232608256 = 109034^2 + 105984^2 .

It is a super-2 number, since 2×23121021412² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23121021412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2890127673 + ... + 2890127680.

Almost surely, 2^23121021412 is an apocalyptic number.

It is an amenable number.

23121021412 is a deficient number, since it is larger than the sum of its proper divisors (17340766066).

23121021412 is a wasteful number, since it uses less digits than its factorization.

23121021412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5780255357 (or 5780255355 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 23121021412 its reverse (21412012132), we get a palindrome (44533033544).

The spelling of 23121021412 in words is "twenty-three billion, one hundred twenty-one million, twenty-one thousand, four hundred twelve".