21140533773 has 12 divisors (see below), whose sum is σ = 30741270300. Its totient is φ = 13999099776.

The previous prime is 21140533723. The next prime is 21140533783. The reversal of 21140533773 is 37733504112.

21140533773 is a `hidden beast` number, since 2 + 11 + 40 + 533 + 7 + 73 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4199428809 + 16941104964 = 64803^2 + 130158^2 .

It is not a de Polignac number, because 21140533773 - 2⁹ = 21140533261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140533723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7881036 + ... + 7883717.

It is an arithmetic number, because the mean of its divisors is an integer number (2561772525).

Almost surely, 2^21140533773 is an apocalyptic number.

It is an amenable number.

21140533773 is a deficient number, since it is larger than the sum of its proper divisors (9600736527).

21140533773 is a wasteful number, since it uses less digits than its factorization.

21140533773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15764908 (or 15764905 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The spelling of 21140533773 in words is "twenty-one billion, one hundred forty million, five hundred thirty-three thousand, seven hundred seventy-three".