61110021 has 16 divisors (see below), whose sum is σ = 96124928. Its totient is φ = 33793200.

The previous prime is 61109999. The next prime is 61110089. The reversal of 61110021 is 12001116.

It is a happy number.

61110021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61110021 - 2⁶ = 61109957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61109979 and 61110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61111021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46285 + ... + 47586.

It is an arithmetic number, because the mean of its divisors is an integer number (6007808).

Almost surely, 2^61110021 is an apocalyptic number.

It is an amenable number.

61110021 is a deficient number, since it is larger than the sum of its proper divisors (35014907).

61110021 is a wasteful number, since it uses less digits than its factorization.

61110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93912.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 61110021 is about 7817.2898756538. The cubic root of 61110021 is about 393.8862413899.

Adding to 61110021 its reverse (12001116), we get a palindrome (73111137).

The spelling of 61110021 in words is "sixty-one million, one hundred ten thousand, twenty-one".