37420021 has 2 divisors, whose sum is σ = 37420022. Its totient is φ = 37420020.

The previous prime is 37420001. The next prime is 37420049. The reversal of 37420021 is 12002473.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37271025 + 148996 = 6105^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 37420021 - 2⁵ = 37419989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37420001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18710010 + 18710011.

It is an arithmetic number, because the mean of its divisors is an integer number (18710011).

Almost surely, 2^37420021 is an apocalyptic number.

It is an amenable number.

37420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

37420021 is an equidigital number, since it uses as much as digits as its factorization.

37420021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 37420021 is about 6117.1906133453. The cubic root of 37420021 is about 334.4783475460.

Adding to 37420021 its reverse (12002473), we get a palindrome (49422494).

The spelling of 37420021 in words is "thirty-seven million, four hundred twenty thousand, twenty-one".