21610512975742 has 4 divisors (see below), whose sum is σ = 32415769463616. Its totient is φ = 10805256487870.

The previous prime is 21610512975739. The next prime is 21610512975743. The reversal of 21610512975742 is 24757921501612.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21610512975742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610512975743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5402628243934 + ... + 5402628243937.

It is an arithmetic number, because the mean of its divisors is an integer number (8103942365904).

Almost surely, 2^{21610512975742} is an apocalyptic number.

21610512975742 is a deficient number, since it is larger than the sum of its proper divisors (10805256487874).

21610512975742 is a wasteful number, since it uses less digits than its factorization.

21610512975742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10805256487873.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 21610512975742 in words is "twenty-one trillion, six hundred ten billion, five hundred twelve million, nine hundred seventy-five thousand, seven hundred forty-two".