111421640 has 48 divisors (see below), whose sum is σ = 275573340. Its totient is φ = 40515200.

The previous prime is 111421619. The next prime is 111421691. The reversal of 111421640 is 46124111.

It can be written as a sum of positive squares in 2 ways, for example, as 102860164 + 8561476 = 10142^2 + 2926^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6671 + ... + 16350.

Almost surely, 2^111421640 is an apocalyptic number.

111421640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111421640 is an abundant number, since it is smaller than the sum of its proper divisors (164151700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111421640 is a wasteful number, since it uses less digits than its factorization.

111421640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23054 (or 23039 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 111421640 is about 10555.6449352941. The cubic root of 111421640 is about 481.1973003517.

Adding to 111421640 its reverse (46124111), we get a palindrome (157545751).

The spelling of 111421640 in words is "one hundred eleven million, four hundred twenty-one thousand, six hundred forty".