21082777328 has 40 divisors (see below), whose sum is σ = 41087513088. Its totient is φ = 10479732992.

The previous prime is 21082777327. The next prime is 21082777343. The reversal of 21082777328 is 82377728012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082777327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1937150 + ... + 1948002.

Almost surely, 2^21082777328 is an apocalyptic number.

It is an amenable number.

21082777328 is a deficient number, since it is larger than the sum of its proper divisors (20004735760).

21082777328 is a wasteful number, since it uses less digits than its factorization.

21082777328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11561 (or 11555 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 21082777328 in words is "twenty-one billion, eighty-two million, seven hundred seventy-seven thousand, three hundred twenty-eight".