21420223113 has 8 divisors (see below), whose sum is σ = 29332197568. Its totient is φ = 13894198704.

The previous prime is 21420223087. The next prime is 21420223133. The reversal of 21420223113 is 31132202412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21420223113 - 2⁹ = 21420222601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420223113.

It is not an unprimeable number, because it can be changed into a prime (21420223133) 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, 96487381 + ... + 96487602.

It is an arithmetic number, because the mean of its divisors is an integer number (3666524696).

Almost surely, 2^21420223113 is an apocalyptic number.

It is an amenable number.

21420223113 is a deficient number, since it is larger than the sum of its proper divisors (7911974455).

21420223113 is a wasteful number, since it uses less digits than its factorization.

21420223113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192975023.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21420223113 its reverse (31132202412), we get a palindrome (52552425525).

The spelling of 21420223113 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-three thousand, one hundred thirteen".