21430526243542 has 8 divisors (see below), whose sum is σ = 34618542393456. Its totient is φ = 9891012112392.

The previous prime is 21430526243437. The next prime is 21430526243561. The reversal of 21430526243542 is 24534262503412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412125504658 + ... + 412125504709.

It is an arithmetic number, because the mean of its divisors is an integer number (4327317799182).

Almost surely, 2^{21430526243542} is an apocalyptic number.

21430526243542 is a deficient number, since it is larger than the sum of its proper divisors (13188016149914).

21430526243542 is a wasteful number, since it uses less digits than its factorization.

21430526243542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824251009382.

The product of its (nonzero) digits is 1382400, while the sum is 43.

Adding to 21430526243542 its reverse (24534262503412), we get a palindrome (45964788746954).

The spelling of 21430526243542 in words is "twenty-one trillion, four hundred thirty billion, five hundred twenty-six million, two hundred forty-three thousand, five hundred forty-two".