2021212185637 has 2 divisors, whose sum is σ = 2021212185638. Its totient is φ = 2021212185636.

The previous prime is 2021212185631. The next prime is 2021212185659. The reversal of 2021212185637 is 7365812121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1679631552036 + 341580633601 = 1296006^2 + 584449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021212185637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021212185637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021212185631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010606092818 + 1010606092819.

It is an arithmetic number, because the mean of its divisors is an integer number (1010606092819).

Almost surely, 2^{2021212185637} is an apocalyptic number.

It is an amenable number.

2021212185637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021212185637 is an equidigital number, since it uses as much as digits as its factorization.

2021212185637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 2021212185637 in words is "two trillion, twenty-one billion, two hundred twelve million, one hundred eighty-five thousand, six hundred thirty-seven".