111661102021 has 8 divisors (see below), whose sum is σ = 127621909440. Its totient is φ = 95702599968.

The previous prime is 111661101953. The next prime is 111661102027. The reversal of 111661102021 is 120201166111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111661102021 - 2¹¹ = 111661099973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111661101983 and 111661102001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111661102027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471271 + ... + 667396.

It is an arithmetic number, because the mean of its divisors is an integer number (15952738680).

Almost surely, 2^111661102021 is an apocalyptic number.

It is an amenable number.

111661102021 is a deficient number, since it is larger than the sum of its proper divisors (15960807419).

111661102021 is a wasteful number, since it uses less digits than its factorization.

111661102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152683.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 111661102021 its reverse (120201166111), we get a palindrome (231862268132).

The spelling of 111661102021 in words is "one hundred eleven billion, six hundred sixty-one million, one hundred two thousand, twenty-one".