145212421 has 8 divisors (see below), whose sum is σ = 155740320. Its totient is φ = 134973072.

The previous prime is 145212373. The next prime is 145212427. The reversal of 145212421 is 124212541.

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 145212421 - 2⁷ = 145212293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145212392 and 145212401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145212427) 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, 71095 + ... + 73108.

It is an arithmetic number, because the mean of its divisors is an integer number (19467540).

Almost surely, 2^145212421 is an apocalyptic number.

It is an amenable number.

145212421 is a deficient number, since it is larger than the sum of its proper divisors (10527899).

145212421 is a wasteful number, since it uses less digits than its factorization.

145212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144275.

The product of its digits is 640, while the sum is 22.

The square root of 145212421 is about 12050.4116527196. The cubic root of 145212421 is about 525.6152074507.

Adding to 145212421 its reverse (124212541), we get a palindrome (269424962).

The spelling of 145212421 in words is "one hundred forty-five million, two hundred twelve thousand, four hundred twenty-one".