21433440188 has 12 divisors (see below), whose sum is σ = 37553771640. Its totient is φ = 10703791152.

The previous prime is 21433440187. The next prime is 21433440191. The reversal of 21433440188 is 88104433412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433440187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3228506 + ... + 3235137.

It is an arithmetic number, because the mean of its divisors is an integer number (3129480970).

Almost surely, 2^21433440188 is an apocalyptic number.

It is an amenable number.

21433440188 is a deficient number, since it is larger than the sum of its proper divisors (16120331452).

21433440188 is a wasteful number, since it uses less digits than its factorization.

21433440188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6464476 (or 6464474 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 21433440188 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty thousand, one hundred eighty-eight".