21442511231542 has 16 divisors (see below), whose sum is σ = 32777358862752. Its totient is φ = 10516808011840.

The previous prime is 21442511231507. The next prime is 21442511231567. The reversal of 21442511231542 is 24513211524412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20248183 + ... + 21280834.

It is an arithmetic number, because the mean of its divisors is an integer number (2048584928922).

Almost surely, 2^{21442511231542} is an apocalyptic number.

21442511231542 is a deficient number, since it is larger than the sum of its proper divisors (11334847631210).

21442511231542 is a wasteful number, since it uses less digits than its factorization.

21442511231542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41533943.

The product of its digits is 76800, while the sum is 37.

Adding to 21442511231542 its reverse (24513211524412), we get a palindrome (45955722755954).

The spelling of 21442511231542 in words is "twenty-one trillion, four hundred forty-two billion, five hundred eleven million, two hundred thirty-one thousand, five hundred forty-two".