37221221 has 4 divisors (see below), whose sum is σ = 37314444. Its totient is φ = 37128000.

The previous prime is 37221203. The next prime is 37221229. The reversal of 37221221 is 12212273.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31528225 + 5692996 = 5615^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 37221221 - 2⁶ = 37221157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 37221193 and 37221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37221229) 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, 46010 + ... + 46811.

It is an arithmetic number, because the mean of its divisors is an integer number (9328611).

Almost surely, 2^37221221 is an apocalyptic number.

It is an amenable number.

37221221 is a deficient number, since it is larger than the sum of its proper divisors (93223).

37221221 is an equidigital number, since it uses as much as digits as its factorization.

37221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93222.

The product of its digits is 336, while the sum is 20.

The square root of 37221221 is about 6100.9196847688. The cubic root of 37221221 is about 333.8849718036.

Adding to 37221221 its reverse (12212273), we get a palindrome (49433494).

The spelling of 37221221 in words is "thirty-seven million, two hundred twenty-one thousand, two hundred twenty-one".