37213021 has 2 divisors, whose sum is σ = 37213022. Its totient is φ = 37213020.

The previous prime is 37213013. The next prime is 37213037. The reversal of 37213021 is 12031273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 6687396 = 5525^2 + 2586^2 .

It is an emirp because it is prime and its reverse (12031273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37213021 - 2³ = 37213013 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 37213021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37213081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18606510 + 18606511.

It is an arithmetic number, because the mean of its divisors is an integer number (18606511).

Almost surely, 2^37213021 is an apocalyptic number.

It is an amenable number.

37213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

37213021 is an equidigital number, since it uses as much as digits as its factorization.

37213021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 37213021 is about 6100.2476179250. The cubic root of 37213021 is about 333.8604512230.

Adding to 37213021 its reverse (12031273), we get a palindrome (49244294).

The spelling of 37213021 in words is "thirty-seven million, two hundred thirteen thousand, twenty-one".