21783143828 has 12 divisors (see below), whose sum is σ = 38579785440. Its totient is φ = 10760347992.

The previous prime is 21783143813. The next prime is 21783143843. The reversal of 21783143828 is 82834138712.

It is an interprime number because it is at equal distance from previous prime (21783143813) and next prime (21783143843).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32805608 + ... + 32806271.

It is an arithmetic number, because the mean of its divisors is an integer number (3214982120).

Almost surely, 2^21783143828 is an apocalyptic number.

It is an amenable number.

21783143828 is a deficient number, since it is larger than the sum of its proper divisors (16796641612).

21783143828 is a wasteful number, since it uses less digits than its factorization.

21783143828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65611966 (or 65611964 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The spelling of 21783143828 in words is "twenty-one billion, seven hundred eighty-three million, one hundred forty-three thousand, eight hundred twenty-eight".