104120215561 has 32 divisors (see below), whose sum is σ = 109584921600. Its totient is φ = 98813917440.

The previous prime is 104120215547. The next prime is 104120215583. The reversal of 104120215561 is 165512021401.

It is a cyclic number.

It is not a de Polignac number, because 104120215561 - 2¹¹ = 104120213513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (104120215961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146854675 + ... + 146855383.

It is an arithmetic number, because the mean of its divisors is an integer number (3424528800).

Almost surely, 2^104120215561 is an apocalyptic number.

It is an amenable number.

104120215561 is a deficient number, since it is larger than the sum of its proper divisors (5464706039).

104120215561 is a wasteful number, since it uses less digits than its factorization.

104120215561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 104120215561 its reverse (165512021401), we get a palindrome (269632236962).

The spelling of 104120215561 in words is "one hundred four billion, one hundred twenty million, two hundred fifteen thousand, five hundred sixty-one".