21423412412 has 12 divisors (see below), whose sum is σ = 37834926360. Its totient is φ = 10613433456.

The previous prime is 21423412397. The next prime is 21423412421. The reversal of 21423412412 is 21421432412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24567698 + ... + 24568569.

It is an arithmetic number, because the mean of its divisors is an integer number (3152910530).

Almost surely, 2^21423412412 is an apocalyptic number.

It is an amenable number.

21423412412 is a deficient number, since it is larger than the sum of its proper divisors (16411513948).

21423412412 is a wasteful number, since it uses less digits than its factorization.

21423412412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49136380 (or 49136378 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21423412412 its reverse (21421432412), we get a palindrome (42844844824).

The spelling of 21423412412 in words is "twenty-one billion, four hundred twenty-three million, four hundred twelve thousand, four hundred twelve".