21032313277 has 2 divisors, whose sum is σ = 21032313278. Its totient is φ = 21032313276.

The previous prime is 21032313251. The next prime is 21032313377. The reversal of 21032313277 is 77231323012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18708494841 + 2323818436 = 136779^2 + 48206^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032313277 - 2¹¹ = 21032311229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21032313217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516156638 + 10516156639.

It is an arithmetic number, because the mean of its divisors is an integer number (10516156639).

Almost surely, 2^21032313277 is an apocalyptic number.

It is an amenable number.

21032313277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032313277 is an equidigital number, since it uses as much as digits as its factorization.

21032313277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 31.

Adding to 21032313277 its reverse (77231323012), we get a palindrome (98263636289).

The spelling of 21032313277 in words is "twenty-one billion, thirty-two million, three hundred thirteen thousand, two hundred seventy-seven".