145722021 has 16 divisors (see below), whose sum is σ = 201964224. Its totient is φ = 93377664.

The previous prime is 145722007. The next prime is 145722053. The reversal of 145722021 is 120227541.

145722021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145722021 - 2⁶ = 145721957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145721982 and 145722000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145722091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1305 + ... + 17121.

It is an arithmetic number, because the mean of its divisors is an integer number (12622764).

Almost surely, 2^145722021 is an apocalyptic number.

It is an amenable number.

145722021 is a deficient number, since it is larger than the sum of its proper divisors (56242203).

145722021 is a wasteful number, since it uses less digits than its factorization.

145722021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15940.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 145722021 is about 12071.5376402511. The cubic root of 145722021 is about 526.2293440549.

Adding to 145722021 its reverse (120227541), we get a palindrome (265949562).

The spelling of 145722021 in words is "one hundred forty-five million, seven hundred twenty-two thousand, twenty-one".