21442030011553 has 2 divisors, whose sum is σ = 21442030011554. Its totient is φ = 21442030011552.

The previous prime is 21442030011551. The next prime is 21442030011559. The reversal of 21442030011553 is 35511003024412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20620744574049 + 821285437504 = 4541007^2 + 906248^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442030011553 - 2¹ = 21442030011551 is a prime.

Together with 21442030011551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21442030011551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721015005776 + 10721015005777.

It is an arithmetic number, because the mean of its divisors is an integer number (10721015005777).

Almost surely, 2^{21442030011553} is an apocalyptic number.

It is an amenable number.

21442030011553 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442030011553 is an equidigital number, since it uses as much as digits as its factorization.

21442030011553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 21442030011553 its reverse (35511003024412), we get a palindrome (56953033035965).

The spelling of 21442030011553 in words is "twenty-one trillion, four hundred forty-two billion, thirty million, eleven thousand, five hundred fifty-three".