20123430421012 has 24 divisors (see below), whose sum is σ = 38573309837160. Its totient is φ = 9143303070720.

The previous prime is 20123430420889. The next prime is 20123430421049. The reversal of 20123430421012 is 21012403432102.

It can be written as a sum of positive squares in 4 ways, for example, as 4204000733956 + 15919429687056 = 2050366^2 + 3989916^2 .

It is a super-2 number, since 2×20123430421012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5102287689 + ... + 5102291632.

It is an arithmetic number, because the mean of its divisors is an integer number (1607221243215).

Almost surely, 2^{20123430421012} is an apocalyptic number.

It is an amenable number.

20123430421012 is a deficient number, since it is larger than the sum of its proper divisors (18449879416148).

20123430421012 is a wasteful number, since it uses less digits than its factorization.

20123430421012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204579371 (or 10204579369 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20123430421012 its reverse (21012403432102), we get a palindrome (41135833853114).

The spelling of 20123430421012 in words is "twenty trillion, one hundred twenty-three billion, four hundred thirty million, four hundred twenty-one thousand, twelve".