21022433137 has 2 divisors, whose sum is σ = 21022433138. Its totient is φ = 21022433136.

The previous prime is 21022433119. The next prime is 21022433147. The reversal of 21022433137 is 73133422012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18311773041 + 2710660096 = 135321^2 + 52064^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022433137 - 2¹⁹ = 21021908849 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022433147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511216568 + 10511216569.

It is an arithmetic number, because the mean of its divisors is an integer number (10511216569).

Almost surely, 2^21022433137 is an apocalyptic number.

It is an amenable number.

21022433137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022433137 is an equidigital number, since it uses as much as digits as its factorization.

21022433137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 28.

Adding to 21022433137 its reverse (73133422012), we get a palindrome (94155855149).

The spelling of 21022433137 in words is "twenty-one billion, twenty-two million, four hundred thirty-three thousand, one hundred thirty-seven".