21032030281 has 2 divisors, whose sum is σ = 21032030282. Its totient is φ = 21032030280.

The previous prime is 21032030237. The next prime is 21032030291. The reversal of 21032030281 is 18203023012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21030800400 + 1229881 = 145020^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032030281 - 2¹⁵ = 21031997513 is a prime.

It is a super-2 number, since 2×21032030281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21032030291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516015140 + 10516015141.

It is an arithmetic number, because the mean of its divisors is an integer number (10516015141).

Almost surely, 2^21032030281 is an apocalyptic number.

It is an amenable number.

21032030281 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032030281 is an equidigital number, since it uses as much as digits as its factorization.

21032030281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21032030281 its reverse (18203023012), we get a palindrome (39235053293).

The spelling of 21032030281 in words is "twenty-one billion, thirty-two million, thirty thousand, two hundred eighty-one".