111429021 has 24 divisors (see below), whose sum is σ = 167311872. Its totient is φ = 65876800.

The previous prime is 111429011. The next prime is 111429029. The reversal of 111429021 is 120924111.

111429021 = 899² + 900² + ... + 1019².

It is a happy number.

It is not a de Polignac number, because 111429021 - 2¹⁵ = 111396253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111429029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11140 + ... + 18626.

It is an arithmetic number, because the mean of its divisors is an integer number (6971328).

Almost surely, 2^111429021 is an apocalyptic number.

111429021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111429021 is a deficient number, since it is larger than the sum of its proper divisors (55882851).

111429021 is a wasteful number, since it uses less digits than its factorization.

111429021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7553 (or 7542 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 111429021 is about 10555.9945528595. The cubic root of 111429021 is about 481.2079255734.

It can be divided in two parts, 1114 and 29021, that added together give a triangular number (30135 = T₂₄₅).

The spelling of 111429021 in words is "one hundred eleven million, four hundred twenty-nine thousand, twenty-one".