145207421 has 8 divisors (see below), whose sum is σ = 155602944. Its totient is φ = 135017920.

The previous prime is 145207417. The next prime is 145207429. The reversal of 145207421 is 124702541.

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 145207421 - 2² = 145207417 is a prime.

It is a super-2 number, since 2×145207421² = 42170390226942482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145207429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50045 + ... + 52866.

It is an arithmetic number, because the mean of its divisors is an integer number (19450368).

Almost surely, 2^145207421 is an apocalyptic number.

It is an amenable number.

145207421 is a deficient number, since it is larger than the sum of its proper divisors (10395523).

145207421 is a wasteful number, since it uses less digits than its factorization.

145207421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103011.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 145207421 is about 12050.2041891414. The cubic root of 145207421 is about 525.6091746652.

Adding to 145207421 its reverse (124702541), we get a palindrome (269909962).

The spelling of 145207421 in words is "one hundred forty-five million, two hundred seven thousand, four hundred twenty-one".