36551021 has 4 divisors (see below), whose sum is σ = 39362652. Its totient is φ = 33739392.

The previous prime is 36550999. The next prime is 36551029. The reversal of 36551021 is 12015563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12015563 = 7 ⋅1716509.

It can be written as a sum of positive squares in 2 ways, for example, as 18826921 + 17724100 = 4339^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 36551021 - 2¹⁴ = 36534637 is a prime.

It is a super-2 number, since 2×36551021² = 2671954272284882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36551029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405796 + ... + 1405821.

It is an arithmetic number, because the mean of its divisors is an integer number (9840663).

Almost surely, 2^36551021 is an apocalyptic number.

It is an amenable number.

36551021 is a deficient number, since it is larger than the sum of its proper divisors (2811631).

36551021 is a wasteful number, since it uses less digits than its factorization.

36551021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811630.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 36551021 is about 6045.7440402319. The cubic root of 36551021 is about 331.8688606036.

Adding to 36551021 its reverse (12015563), we get a palindrome (48566584).

The spelling of 36551021 in words is "thirty-six million, five hundred fifty-one thousand, twenty-one".