21032937977 has 2 divisors, whose sum is σ = 21032937978. Its totient is φ = 21032937976.

The previous prime is 21032937923. The next prime is 21032938007. The reversal of 21032937977 is 77973923012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16707113536 + 4325824441 = 129256^2 + 65771^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032937977 - 2¹⁴ = 21032921593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21032937377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516468988 + 10516468989.

It is an arithmetic number, because the mean of its divisors is an integer number (10516468989).

Almost surely, 2^21032937977 is an apocalyptic number.

It is an amenable number.

21032937977 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032937977 is an equidigital number, since it uses as much as digits as its factorization.

21032937977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000188, while the sum is 50.

The spelling of 21032937977 in words is "twenty-one billion, thirty-two million, nine hundred thirty-seven thousand, nine hundred seventy-seven".