37221021 has 24 divisors (see below), whose sum is σ = 54976376. Its totient is φ = 24261120.

The previous prime is 37221017. The next prime is 37221043. The reversal of 37221021 is 12012273.

It can be written as a sum of positive squares in 4 ways, for example, as 2576025 + 34644996 = 1605^2 + 5886^2 .

It is not a de Polignac number, because 37221021 - 2² = 37221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 37220985 and 37221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37221011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118761 + ... + 119073.

Almost surely, 2^37221021 is an apocalyptic number.

It is an amenable number.

37221021 is a deficient number, since it is larger than the sum of its proper divisors (17755355).

37221021 is a wasteful number, since it uses less digits than its factorization.

37221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 37221021 is about 6100.9032937754. The cubic root of 37221021 is about 333.8843737835.

Adding to 37221021 its reverse (12012273), we get a palindrome (49233294).

The spelling of 37221021 in words is "thirty-seven million, two hundred twenty-one thousand, twenty-one".