21143211144 has 64 divisors (see below), whose sum is σ = 57676207680. Its totient is φ = 6405600000.

The previous prime is 21143211137. The next prime is 21143211169. The reversal of 21143211144 is 44111234112.

It is a happy number.

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

It is a nude number because it is divisible by every one of its digits.

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, 2239554 + ... + 2248974.

It is an arithmetic number, because the mean of its divisors is an integer number (901190745).

Almost surely, 2^21143211144 is an apocalyptic number.

21143211144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21143211144 is an abundant number, since it is smaller than the sum of its proper divisors (36532996536).

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

21143211144 is a wasteful number, since it uses less digits than its factorization.

21143211144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17942 (or 17938 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

Adding to 21143211144 its reverse (44111234112), we get a palindrome (65254445256).

The spelling of 21143211144 in words is "twenty-one billion, one hundred forty-three million, two hundred eleven thousand, one hundred forty-four".