21323003057 has 2 divisors, whose sum is σ = 21323003058. Its totient is φ = 21323003056.

The previous prime is 21323003021. The next prime is 21323003131. The reversal of 21323003057 is 75030032312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15012130576 + 6310872481 = 122524^2 + 79441^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323003057 - 2⁶ = 21323002993 is a prime.

It is not a weakly prime, because it can be changed into another prime (21323003557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661501528 + 10661501529.

It is an arithmetic number, because the mean of its divisors is an integer number (10661501529).

Almost surely, 2^21323003057 is an apocalyptic number.

It is an amenable number.

21323003057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323003057 is an equidigital number, since it uses as much as digits as its factorization.

21323003057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 26.

Adding to 21323003057 its reverse (75030032312), we get a palindrome (96353035369).

The spelling of 21323003057 in words is "twenty-one billion, three hundred twenty-three million, three thousand, fifty-seven".