145322021 has 8 divisors (see below), whose sum is σ = 156747360. Its totient is φ = 133931952.

The previous prime is 145321997. The next prime is 145322029. The reversal of 145322021 is 120223541.

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

It is a cyclic number.

It is not a de Polignac number, because 145322021 - 2¹⁴ = 145305637 is a prime.

It is a super-2 number, since 2×145322021² = 42236979575048882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 145321984 and 145322002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145322029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86 + ... + 17048.

It is an arithmetic number, because the mean of its divisors is an integer number (19593420).

Almost surely, 2^145322021 is an apocalyptic number.

It is an amenable number.

145322021 is a deficient number, since it is larger than the sum of its proper divisors (11425339).

145322021 is a wasteful number, since it uses less digits than its factorization.

145322021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17635.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 145322021 is about 12054.9583574561. The cubic root of 145322021 is about 525.7474113380.

Adding to 145322021 its reverse (120223541), we get a palindrome (265545562).

The spelling of 145322021 in words is "one hundred forty-five million, three hundred twenty-two thousand, twenty-one".