21442105130452 has 6 divisors (see below), whose sum is σ = 37523683978298. Its totient is φ = 10721052565224.

The previous prime is 21442105130401. The next prime is 21442105130513. The reversal of 21442105130452 is 25403150124412.

It can be written as a sum of positive squares in only one way, i.e., 21361719271876 + 80385858576 = 4621874^2 + 283524^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680263141303 + ... + 2680263141310.

Almost surely, 2^{21442105130452} is an apocalyptic number.

It is an amenable number.

21442105130452 is a deficient number, since it is larger than the sum of its proper divisors (16081578847846).

21442105130452 is a wasteful number, since it uses less digits than its factorization.

21442105130452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360526282617 (or 5360526282615 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 21442105130452 its reverse (25403150124412), we get a palindrome (46845255254864).

The spelling of 21442105130452 in words is "twenty-one trillion, four hundred forty-two billion, one hundred five million, one hundred thirty thousand, four hundred fifty-two".