21513501310042 has 16 divisors (see below), whose sum is σ = 36880395469632. Its totient is φ = 9220045112640.

The previous prime is 21513501310031. The next prime is 21513501310073. The reversal of 21513501310042 is 24001310531512.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3187873 + ... + 7293115.

It is an arithmetic number, because the mean of its divisors is an integer number (2305024716852).

Almost surely, 2^{21513501310042} is an apocalyptic number.

21513501310042 is a deficient number, since it is larger than the sum of its proper divisors (15366894159590).

21513501310042 is a wasteful number, since it uses less digits than its factorization.

21513501310042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479573.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 21513501310042 its reverse (24001310531512), we get a palindrome (45514811841554).

The spelling of 21513501310042 in words is "twenty-one trillion, five hundred thirteen billion, five hundred one million, three hundred ten thousand, forty-two".