21002341156 has 48 divisors (see below), whose sum is σ = 38646720000. Its totient is φ = 9973624320.

The previous prime is 21002341133. The next prime is 21002341189. The reversal of 21002341156 is 65114320012.

It is a happy number.

It is a super-2 number, since 2×21002341156² (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 21002341156.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5185020 + ... + 5189068.

It is an arithmetic number, because the mean of its divisors is an integer number (805140000).

Almost surely, 2^21002341156 is an apocalyptic number.

It is an amenable number.

21002341156 is a deficient number, since it is larger than the sum of its proper divisors (17644378844).

21002341156 is a wasteful number, since it uses less digits than its factorization.

21002341156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4852 (or 4850 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21002341156 its reverse (65114320012), we get a palindrome (86116661168).

The spelling of 21002341156 in words is "twenty-one billion, two million, three hundred forty-one thousand, one hundred fifty-six".