21143405140 has 96 divisors (see below), whose sum is σ = 52626018816. Its totient is φ = 7034173440.

The previous prime is 21143405131. The next prime is 21143405149. The reversal of 21143405140 is 4150434112.

It is an interprime number because it is at equal distance from previous prime (21143405131) and next prime (21143405149).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143405149) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 290469 + ... + 355891.

It is an arithmetic number, because the mean of its divisors is an integer number (548187696).

Almost surely, 2^21143405140 is an apocalyptic number.

21143405140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21143405140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26313009408).

21143405140 is an abundant number, since it is smaller than the sum of its proper divisors (31482613676).

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

21143405140 is a wasteful number, since it uses less digits than its factorization.

21143405140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65569 (or 65567 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21143405140 its reverse (4150434112), we get a palindrome (25293839252).

The spelling of 21143405140 in words is "twenty-one billion, one hundred forty-three million, four hundred five thousand, one hundred forty".