21283956188 has 24 divisors (see below), whose sum is σ = 40943193984. Its totient is φ = 9600671600.

The previous prime is 21283956173. The next prime is 21283956217. The reversal of 21283956188 is 88165938212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1840520 + ... + 1852047.

It is an arithmetic number, because the mean of its divisors is an integer number (1705966416).

Almost surely, 2^21283956188 is an apocalyptic number.

It is an amenable number.

21283956188 is a deficient number, since it is larger than the sum of its proper divisors (19659237796).

21283956188 is a wasteful number, since it uses less digits than its factorization.

21283956188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692713 (or 3692711 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 53.

The spelling of 21283956188 in words is "twenty-one billion, two hundred eighty-three million, nine hundred fifty-six thousand, one hundred eighty-eight".