653212021 has 8 divisors (see below), whose sum is σ = 814394304. Its totient is φ = 508996320.

The previous prime is 653212019. The next prime is 653212031. The reversal of 653212021 is 120212356.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 653212021 - 2¹ = 653212019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 653211983 and 653212001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653212031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4241560 + ... + 4241713.

It is an arithmetic number, because the mean of its divisors is an integer number (101799288).

Almost surely, 2^653212021 is an apocalyptic number.

It is an amenable number.

653212021 is a deficient number, since it is larger than the sum of its proper divisors (161182283).

653212021 is a wasteful number, since it uses less digits than its factorization.

653212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8483291.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 653212021 is about 25558.0128531152. The cubic root of 653212021 is about 867.6636220752.

Adding to 653212021 its reverse (120212356), we get a palindrome (773424377).

The spelling of 653212021 in words is "six hundred fifty-three million, two hundred twelve thousand, twenty-one".