145562021 has 16 divisors (see below), whose sum is σ = 167711040. Its totient is φ = 124945920.

The previous prime is 145561993. The next prime is 145562029. The reversal of 145562021 is 120265541.

It is not a de Polignac number, because 145562021 - 2¹⁴ = 145545637 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 (145562029) 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 15 ways as a sum of consecutive naturals, for example, 72791 + ... + 74763.

It is an arithmetic number, because the mean of its divisors is an integer number (10481940).

Almost surely, 2^145562021 is an apocalyptic number.

145562021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145562021 is a deficient number, since it is larger than the sum of its proper divisors (22149019).

145562021 is a wasteful number, since it uses less digits than its factorization.

145562021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 145562021 is about 12064.9086610716. The cubic root of 145562021 is about 526.0366769280.

The spelling of 145562021 in words is "one hundred forty-five million, five hundred sixty-two thousand, twenty-one".