21420322472 has 32 divisors (see below), whose sum is σ = 40567111200. Its totient is φ = 10602820800.

The previous prime is 21420322471. The next prime is 21420322513. The reversal of 21420322472 is 27422302412.

It is not an unprimeable number, because it can be changed into a prime (21420322471) 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, 414722 + ... + 463502.

It is an arithmetic number, because the mean of its divisors is an integer number (1267722225).

Almost surely, 2^21420322472 is an apocalyptic number.

It is an amenable number.

21420322472 is a deficient number, since it is larger than the sum of its proper divisors (19146788728).

21420322472 is a wasteful number, since it uses less digits than its factorization.

21420322472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49337 (or 49333 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 29.

Adding to 21420322472 its reverse (27422302412), we get a palindrome (48842624884).

The spelling of 21420322472 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-two thousand, four hundred seventy-two".