64212521 has 8 divisors (see below), whose sum is σ = 66164040. Its totient is φ = 62288512.

The previous prime is 64212503. The next prime is 64212523. The reversal of 64212521 is 12521246.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 132496 + 64080025 = 364^2 + 8005^2 .

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 64212521 - 2¹⁴ = 64196137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64212523) 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, 2090 + ... + 11523.

It is an arithmetic number, because the mean of its divisors is an integer number (8270505).

Almost surely, 2^64212521 is an apocalyptic number.

It is an amenable number.

64212521 is a deficient number, since it is larger than the sum of its proper divisors (1951519).

64212521 is a wasteful number, since it uses less digits than its factorization.

64212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13755.

The product of its digits is 960, while the sum is 23.

The square root of 64212521 is about 8013.2715541157. The cubic root of 64212521 is about 400.4422629119.

Adding to 64212521 its reverse (12521246), we get a palindrome (76733767).

It can be divided in two parts, 64 and 212521, that multiplied together give a square (13601344 = 3688²).

The spelling of 64212521 in words is "sixty-four million, two hundred twelve thousand, five hundred twenty-one".