2000021001637 has 2 divisors, whose sum is σ = 2000021001638. Its totient is φ = 2000021001636.

The previous prime is 2000021001623. The next prime is 2000021001703. The reversal of 2000021001637 is 7361001200002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1717564892481 + 282456109156 = 1310559^2 + 531466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2000021001637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000021001337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000010500818 + 1000010500819.

It is an arithmetic number, because the mean of its divisors is an integer number (1000010500819).

Almost surely, 2^{2000021001637} is an apocalyptic number.

It is an amenable number.

2000021001637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000021001637 is an equidigital number, since it uses as much as digits as its factorization.

2000021001637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 2000021001637 its reverse (7361001200002), we get a palindrome (9361022201639).

The spelling of 2000021001637 in words is "two trillion, twenty-one million, one thousand, six hundred thirty-seven".