21442505123345 has 16 divisors (see below), whose sum is σ = 27758643708240. Its totient is φ = 15840323426304.

The previous prime is 21442505123341. The next prime is 21442505123381. The reversal of 21442505123345 is 54332150524412.

It can be written as a sum of positive squares in 8 ways, for example, as 1055618569489 + 20386886553856 = 1027433^2 + 4515184^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442505123345 - 2² = 21442505123341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21442505123341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2379851780 + ... + 2379860789.

It is an arithmetic number, because the mean of its divisors is an integer number (1734915231765).

Almost surely, 2^{21442505123345} is an apocalyptic number.

It is an amenable number.

21442505123345 is a deficient number, since it is larger than the sum of its proper divisors (6316138584895).

21442505123345 is a wasteful number, since it uses less digits than its factorization.

21442505123345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759712644.

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 21442505123345 its reverse (54332150524412), we get a palindrome (75774655647757).

The spelling of 21442505123345 in words is "twenty-one trillion, four hundred forty-two billion, five hundred five million, one hundred twenty-three thousand, three hundred forty-five".