21002342352 has 20 divisors (see below), whose sum is σ = 54256051200. Its totient is φ = 7000780768.

The previous prime is 21002342297. The next prime is 21002342363. The reversal of 21002342352 is 25324320012.

It is a super-2 number, since 2×21002342352² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218774352 + ... + 218774447.

It is an arithmetic number, because the mean of its divisors is an integer number (2712802560).

Almost surely, 2^21002342352 is an apocalyptic number.

It is an amenable number.

21002342352 is an abundant number, since it is smaller than the sum of its proper divisors (33253708848).

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

21002342352 is a wasteful number, since it uses less digits than its factorization.

21002342352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437548810 (or 437548804 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21002342352 its reverse (25324320012), we get a palindrome (46326662364).

The spelling of 21002342352 in words is "twenty-one billion, two million, three hundred forty-two thousand, three hundred fifty-two".