2106221737 has 2 divisors, whose sum is σ = 2106221738. Its totient is φ = 2106221736.

The previous prime is 2106221729. The next prime is 2106221779. The reversal of 2106221737 is 7371226012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1167657241 + 938564496 = 34171^2 + 30636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106221737 - 2³ = 2106221729 is a prime.

It is a super-2 number, since 2×2106221737² = 8872340010822594338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2106221699 and 2106221708.

It is not a weakly prime, because it can be changed into another prime (2106221717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053110868 + 1053110869.

It is an arithmetic number, because the mean of its divisors is an integer number (1053110869).

Almost surely, 2^2106221737 is an apocalyptic number.

It is an amenable number.

2106221737 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106221737 is an equidigital number, since it uses as much as digits as its factorization.

2106221737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 2106221737 is about 45893.5914589390. The cubic root of 2106221737 is about 1281.8425889951.

Adding to 2106221737 its reverse (7371226012), we get a palindrome (9477447749).

The spelling of 2106221737 in words is "two billion, one hundred six million, two hundred twenty-one thousand, seven hundred thirty-seven".