21141302257 has 2 divisors, whose sum is σ = 21141302258. Its totient is φ = 21141302256.

The previous prime is 21141302243. The next prime is 21141302293. The reversal of 21141302257 is 75220314112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14805779041 + 6335523216 = 121679^2 + 79596^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141302257 - 2¹⁹ = 21140777969 is a prime.

It is a super-2 number, since 2×21141302257² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21141302057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570651128 + 10570651129.

It is an arithmetic number, because the mean of its divisors is an integer number (10570651129).

Almost surely, 2^21141302257 is an apocalyptic number.

It is an amenable number.

21141302257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141302257 is an equidigital number, since it uses as much as digits as its factorization.

21141302257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 21141302257 its reverse (75220314112), we get a palindrome (96361616369).

The spelling of 21141302257 in words is "twenty-one billion, one hundred forty-one million, three hundred two thousand, two hundred fifty-seven".