37220021 has 12 divisors (see below), whose sum is σ = 40910820. Its totient is φ = 33815040.

The previous prime is 37220011. The next prime is 37220033. The reversal of 37220021 is 12002273.

It can be written as a sum of positive squares in 6 ways, for example, as 2280100 + 34939921 = 1510^2 + 5911^2 .

It is not a de Polignac number, because 37220021 - 2²² = 33025717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37220011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6161 + ... + 10601.

It is an arithmetic number, because the mean of its divisors is an integer number (3409235).

Almost surely, 2^37220021 is an apocalyptic number.

It is an amenable number.

37220021 is a deficient number, since it is larger than the sum of its proper divisors (3690799).

37220021 is a wasteful number, since it uses less digits than its factorization.

37220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504 (or 4487 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 37220021 is about 6100.8213381478. The cubic root of 37220021 is about 333.8813836509.

Adding to 37220021 its reverse (12002273), we get a palindrome (49222294).

The spelling of 37220021 in words is "thirty-seven million, two hundred twenty thousand, twenty-one".