21440152373 has 2 divisors, whose sum is σ = 21440152374. Its totient is φ = 21440152372.

The previous prime is 21440152343. The next prime is 21440152453. The reversal of 21440152373 is 37325104412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21275723044 + 164429329 = 145862^2 + 12823^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440152373 - 2⁶ = 21440152309 is a prime.

It is a super-3 number, since 3×21440152373³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440152303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720076186 + 10720076187.

It is an arithmetic number, because the mean of its divisors is an integer number (10720076187).

Almost surely, 2^21440152373 is an apocalyptic number.

It is an amenable number.

21440152373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440152373 is an equidigital number, since it uses as much as digits as its factorization.

21440152373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 32.

Adding to 21440152373 its reverse (37325104412), we get a palindrome (58765256785).

The spelling of 21440152373 in words is "twenty-one billion, four hundred forty million, one hundred fifty-two thousand, three hundred seventy-three".