111021621487 has 4 divisors (see below), whose sum is σ = 126881853136. Its totient is φ = 95161389840.

The previous prime is 111021621449. The next prime is 111021621493. The reversal of 111021621487 is 784126120111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111021621487 - 2¹¹ = 111021619439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021621497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7930115814 + ... + 7930115827.

It is an arithmetic number, because the mean of its divisors is an integer number (31720463284).

Almost surely, 2^111021621487 is an apocalyptic number.

111021621487 is a deficient number, since it is larger than the sum of its proper divisors (15860231649).

111021621487 is an equidigital number, since it uses as much as digits as its factorization.

111021621487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15860231648.

The product of its (nonzero) digits is 5376, while the sum is 34.

Adding to 111021621487 its reverse (784126120111), we get a palindrome (895147741598).

The spelling of 111021621487 in words is "one hundred eleven billion, twenty-one million, six hundred twenty-one thousand, four hundred eighty-seven".