21411423012 has 48 divisors (see below), whose sum is σ = 57303317120. Its totient is φ = 6095457792.

The previous prime is 21411423001. The next prime is 21411423017. The reversal of 21411423012 is 21032411412.

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 21411423012.

It is not an unprimeable number, because it can be changed into a prime (21411423017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436837 + ... + 483372.

Almost surely, 2^21411423012 is an apocalyptic number.

It is an amenable number.

21411423012 is an abundant number, since it is smaller than the sum of its proper divisors (35891894108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21411423012 is a wasteful number, since it uses less digits than its factorization.

21411423012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920500 (or 920498 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21411423012 its reverse (21032411412), we get a palindrome (42443834424).

The spelling of 21411423012 in words is "twenty-one billion, four hundred eleven million, four hundred twenty-three thousand, twelve".