36631021 has 4 divisors (see below), whose sum is σ = 41864032. Its totient is φ = 31398012.

The previous prime is 36630967. The next prime is 36631027. The reversal of 36631021 is 12013663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 36631021 - 2¹³ = 36622829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 36630983 and 36631001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36631027) 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, 2616495 + ... + 2616508.

It is an arithmetic number, because the mean of its divisors is an integer number (10466008).

Almost surely, 2^36631021 is an apocalyptic number.

It is an amenable number.

36631021 is a deficient number, since it is larger than the sum of its proper divisors (5233011).

36631021 is an equidigital number, since it uses as much as digits as its factorization.

36631021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5233010.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 36631021 is about 6052.3566484470. The cubic root of 36631021 is about 332.1108069917.

Adding to 36631021 its reverse (12013663), we get a palindrome (48644684).

The spelling of 36631021 in words is "thirty-six million, six hundred thirty-one thousand, twenty-one".