212073521 has 16 divisors (see below), whose sum is σ = 248427648. Its totient is φ = 178886400.

The previous prime is 212073517. The next prime is 212073523. The reversal of 212073521 is 125370212.

It is a happy number.

It is not a de Polignac number, because 212073521 - 2² = 212073517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212073523) 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, 5291 + ... + 21263.

It is an arithmetic number, because the mean of its divisors is an integer number (15526728).

Almost surely, 2^212073521 is an apocalyptic number.

It is an amenable number.

212073521 is a deficient number, since it is larger than the sum of its proper divisors (36354127).

212073521 is a wasteful number, since it uses less digits than its factorization.

212073521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16072.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 212073521 is about 14562.7442812129. The cubic root of 212073521 is about 596.3421164267.

The spelling of 212073521 in words is "two hundred twelve million, seventy-three thousand, five hundred twenty-one".