21240005302 has 4 divisors (see below), whose sum is σ = 31860007956. Its totient is φ = 10620002650.

The previous prime is 21240005287. The next prime is 21240005389. The reversal of 21240005302 is 20350004212.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21240005302² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21240005302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310001324 + ... + 5310001327.

It is an arithmetic number, because the mean of its divisors is an integer number (7965001989).

Almost surely, 2^21240005302 is an apocalyptic number.

21240005302 is a deficient number, since it is larger than the sum of its proper divisors (10620002654).

21240005302 is a wasteful number, since it uses less digits than its factorization.

21240005302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620002653.

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21240005302 its reverse (20350004212), we get a palindrome (41590009514).

The spelling of 21240005302 in words is "twenty-one billion, two hundred forty million, five thousand, three hundred two".