201012020521 has 8 divisors (see below), whose sum is σ = 217419790280. Its totient is φ = 184739294592.

The previous prime is 201012020519. The next prime is 201012020557. The reversal of 201012020521 is 125020210102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29089008025 + 171923012496 = 170555^2 + 414636^2 .

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 201012020521 - 2¹ = 201012020519 is a prime.

It is a super-2 number, since 2×201012020521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201012020495 and 201012020504.

It is not an unprimeable number, because it can be changed into a prime (201012020591) 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, 33757860 + ... + 33763813.

It is an arithmetic number, because the mean of its divisors is an integer number (27177473785).

Almost surely, 2^201012020521 is an apocalyptic number.

It is an amenable number.

201012020521 is a deficient number, since it is larger than the sum of its proper divisors (16407769759).

201012020521 is a wasteful number, since it uses less digits than its factorization.

201012020521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67521915.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 201012020521 its reverse (125020210102), we get a palindrome (326032230623).

The spelling of 201012020521 in words is "two hundred one billion, twelve million, twenty thousand, five hundred twenty-one".