21162640242104 has 16 divisors (see below), whose sum is σ = 42014065186800. Its totient is φ = 9958889525632.

The previous prime is 21162640242083. The next prime is 21162640242137. The reversal of 21162640242104 is 40124204626112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77803824284 + ... + 77803824555.

It is an arithmetic number, because the mean of its divisors is an integer number (2625879074175).

Almost surely, 2^{21162640242104} is an apocalyptic number.

It is an amenable number.

21162640242104 is a deficient number, since it is larger than the sum of its proper divisors (20851424944696).

21162640242104 is a wasteful number, since it uses less digits than its factorization.

21162640242104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155607648862 (or 155607648858 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

Adding to 21162640242104 its reverse (40124204626112), we get a palindrome (61286844868216).

The spelling of 21162640242104 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred forty million, two hundred forty-two thousand, one hundred four".