145212521 has 8 divisors (see below), whose sum is σ = 154486944. Its totient is φ = 136019520.

The previous prime is 145212503. The next prime is 145212523. The reversal of 145212521 is 125212541.

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 145212521 - 2²² = 141018217 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145212523) 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 7 ways as a sum of consecutive naturals, for example, 16655 + ... + 23828.

It is an arithmetic number, because the mean of its divisors is an integer number (19310868).

Almost surely, 2^145212521 is an apocalyptic number.

It is an amenable number.

145212521 is a deficient number, since it is larger than the sum of its proper divisors (9274423).

145212521 is a wasteful number, since it uses less digits than its factorization.

145212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40711.

The product of its digits is 800, while the sum is 23.

The square root of 145212521 is about 12050.4158019547. The cubic root of 145212521 is about 525.6153281050.

The spelling of 145212521 in words is "one hundred forty-five million, two hundred twelve thousand, five hundred twenty-one".