21223132057 has 2 divisors, whose sum is σ = 21223132058. Its totient is φ = 21223132056.

The previous prime is 21223132019. The next prime is 21223132109. The reversal of 21223132057 is 75023132212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19392233536 + 1830898521 = 139256^2 + 42789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223132057 is a prime.

It is a super-2 number, since 2×21223132057² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21223135057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611566028 + 10611566029.

It is an arithmetic number, because the mean of its divisors is an integer number (10611566029).

Almost surely, 2^21223132057 is an apocalyptic number.

It is an amenable number.

21223132057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223132057 is an equidigital number, since it uses as much as digits as its factorization.

21223132057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 21223132057 its reverse (75023132212), we get a palindrome (96246264269).

The spelling of 21223132057 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, fifty-seven".