111021420 has 24 divisors (see below), whose sum is σ = 310860144. Its totient is φ = 29605696.

The previous prime is 111021409. The next prime is 111021431. The reversal of 111021420 is 24120111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111021409) and next prime (111021431).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 111021396 and 111021405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925119 + ... + 925238.

It is an arithmetic number, because the mean of its divisors is an integer number (12952506).

Almost surely, 2^111021420 is an apocalyptic number.

111021420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111021420 is an abundant number, since it is smaller than the sum of its proper divisors (199838724).

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

111021420 is a wasteful number, since it uses less digits than its factorization.

111021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850369 (or 1850367 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 111021420 is about 10536.6702520293. The cubic root of 111021420 is about 480.6204649805.

Adding to 111021420 its reverse (24120111), we get a palindrome (135141531).

The spelling of 111021420 in words is "one hundred eleven million, twenty-one thousand, four hundred twenty".