21143241340 has 24 divisors (see below), whose sum is σ = 47816254080. Its totient is φ = 7806735168.

The previous prime is 21143241313. The next prime is 21143241391. The reversal of 21143241340 is 4314234112.

It is a super-2 number, since 2×21143241340² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 40659820 + ... + 40660339.

It is an arithmetic number, because the mean of its divisors is an integer number (1992343920).

Almost surely, 2^21143241340 is an apocalyptic number.

21143241340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143241340 is an abundant number, since it is smaller than the sum of its proper divisors (26673012740).

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

21143241340 is a wasteful number, since it uses less digits than its factorization.

21143241340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81320181 (or 81320179 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21143241340 its reverse (4314234112), we get a palindrome (25457475452).

The spelling of 21143241340 in words is "twenty-one billion, one hundred forty-three million, two hundred forty-one thousand, three hundred forty".