111921890 has 8 divisors (see below), whose sum is σ = 201459420. Its totient is φ = 44768752.

The previous prime is 111921889. The next prime is 111921911. The reversal of 111921890 is 98129111.

It can be written as a sum of positive squares in 2 ways, for example, as 105904681 + 6017209 = 10291^2 + 2453^2 .

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

It is a super-2 number, since 2×111921890² = 25053018922344200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5596085 + ... + 5596104.

Almost surely, 2^111921890 is an apocalyptic number.

111921890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111921890 is a deficient number, since it is larger than the sum of its proper divisors (89537530).

111921890 is a wasteful number, since it uses less digits than its factorization.

111921890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11192196.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 111921890 is about 10579.3142499880. The cubic root of 111921890 is about 481.9163695058.

The spelling of 111921890 in words is "one hundred eleven million, nine hundred twenty-one thousand, eight hundred ninety".