37317628021 has 4 divisors (see below), whose sum is σ = 37330674444. Its totient is φ = 37304581600.

The previous prime is 37317628001. The next prime is 37317628037. The reversal of 37317628021 is 12082671373.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12082671373 = 991 ⋅12192403.

It can be written as a sum of positive squares in 2 ways, for example, as 11745140625 + 25572487396 = 108375^2 + 159914^2 .

It is a cyclic number.

It is not a de Polignac number, because 37317628021 - 2⁹ = 37317627509 is a prime.

It is a super-2 number, since 2×37317628021² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37317628001) 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, 6518920 + ... + 6524641.

It is an arithmetic number, because the mean of its divisors is an integer number (9332668611).

Almost surely, 2^37317628021 is an apocalyptic number.

It is an amenable number.

37317628021 is a deficient number, since it is larger than the sum of its proper divisors (13046423).

37317628021 is a wasteful number, since it uses less digits than its factorization.

37317628021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13046422.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 37317628021 in words is "thirty-seven billion, three hundred seventeen million, six hundred twenty-eight thousand, twenty-one".