21032543977 has 2 divisors, whose sum is σ = 21032543978. Its totient is φ = 21032543976.

The previous prime is 21032543963. The next prime is 21032544037. The reversal of 21032543977 is 77934523012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18642898521 + 2389645456 = 136539^2 + 48884^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032543977 - 2⁷ = 21032543849 is a prime.

It is a super-2 number, since 2×21032543977² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21032543377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516271988 + 10516271989.

It is an arithmetic number, because the mean of its divisors is an integer number (10516271989).

Almost surely, 2^21032543977 is an apocalyptic number.

It is an amenable number.

21032543977 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032543977 is an equidigital number, since it uses as much as digits as its factorization.

21032543977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 21032543977 in words is "twenty-one billion, thirty-two million, five hundred forty-three thousand, nine hundred seventy-seven".