61104156021 has 6 divisors (see below), whose sum is σ = 88261558710. Its totient is φ = 40736104008.

The previous prime is 61104156013. The next prime is 61104156037. The reversal of 61104156021 is 12065140116.

61104156021 is a `hidden beast` number, since 6 + 1 + 10 + 41 + 5 + 602 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38450895921 + 22653260100 = 196089^2 + 150510^2 .

It is not a de Polignac number, because 61104156021 - 2³ = 61104156013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61104156011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3394675326 + ... + 3394675343.

It is an arithmetic number, because the mean of its divisors is an integer number (14710259785).

Almost surely, 2^61104156021 is an apocalyptic number.

It is an amenable number.

61104156021 is a deficient number, since it is larger than the sum of its proper divisors (27157402689).

61104156021 is a wasteful number, since it uses less digits than its factorization.

61104156021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789350675 (or 6789350672 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 61104156021 its reverse (12065140116), we get a palindrome (73169296137).

The spelling of 61104156021 in words is "sixty-one billion, one hundred four million, one hundred fifty-six thousand, twenty-one".