35872021 has 4 divisors (see below), whose sum is σ = 35884044. Its totient is φ = 35860000.

The previous prime is 35871977. The next prime is 35872027. The reversal of 35872021 is 12027853.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 34398225 + 1473796 = 5865^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 35872021 - 2⁷ = 35871893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35872027) 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, 2241 + ... + 8761.

It is an arithmetic number, because the mean of its divisors is an integer number (8971011).

Almost surely, 2^35872021 is an apocalyptic number.

It is an amenable number.

35872021 is a deficient number, since it is larger than the sum of its proper divisors (12023).

35872021 is an equidigital number, since it uses as much as digits as its factorization.

35872021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12022.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 35872021 is about 5989.3255880775. The cubic root of 35872021 is about 329.8009849923.

Adding to 35872021 its reverse (12027853), we get a palindrome (47899874).

The spelling of 35872021 in words is "thirty-five million, eight hundred seventy-two thousand, twenty-one".