21230174712 has 32 divisors (see below), whose sum is σ = 53371958400. Its totient is φ = 7037188704.

The previous prime is 21230174689. The next prime is 21230174717. The reversal of 21230174712 is 21747103212.

It is a self number, because there is not a number n which added to its sum of digits gives 21230174712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230174717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2466628 + ... + 2475219.

It is an arithmetic number, because the mean of its divisors is an integer number (1667873700).

Almost surely, 2^21230174712 is an apocalyptic number.

It is an amenable number.

21230174712 is an abundant number, since it is smaller than the sum of its proper divisors (32141783688).

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

21230174712 is a wasteful number, since it uses less digits than its factorization.

21230174712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942035 (or 4942031 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 21230174712 its reverse (21747103212), we get a palindrome (42977277924).

The spelling of 21230174712 in words is "twenty-one billion, two hundred thirty million, one hundred seventy-four thousand, seven hundred twelve".