21140645377 has 8 divisors (see below), whose sum is σ = 22011294312. Its totient is φ = 20286902400.

The previous prime is 21140645371. The next prime is 21140645389. The reversal of 21140645377 is 77354604112.

It can be written as a sum of positive squares in 4 ways, for example, as 446096641 + 20694548736 = 21121^2 + 143856^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140645377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140645371) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4223938 + ... + 4228939.

It is an arithmetic number, because the mean of its divisors is an integer number (2751411789).

Almost surely, 2^21140645377 is an apocalyptic number.

It is an amenable number.

21140645377 is a deficient number, since it is larger than the sum of its proper divisors (870648935).

21140645377 is an equidigital number, since it uses as much as digits as its factorization.

21140645377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8452979.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 21140645377 in words is "twenty-one billion, one hundred forty million, six hundred forty-five thousand, three hundred seventy-seven".