2106620281 has 2 divisors, whose sum is σ = 2106620282. Its totient is φ = 2106620280.

The previous prime is 2106620273. The next prime is 2106620359. The reversal of 2106620281 is 1820266012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2087119225 + 19501056 = 45685^2 + 4416^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106620281 - 2³ = 2106620273 is a prime.

It is a super-2 number, since 2×2106620281² = 8875698016641037922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2106620251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053310140 + 1053310141.

It is an arithmetic number, because the mean of its divisors is an integer number (1053310141).

Almost surely, 2^2106620281 is an apocalyptic number.

It is an amenable number.

2106620281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106620281 is an equidigital number, since it uses as much as digits as its factorization.

2106620281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 2106620281 is about 45897.9332976987. The cubic root of 2106620281 is about 1281.9234349391.

Adding to 2106620281 its reverse (1820266012), we get a palindrome (3926886293).

The spelling of 2106620281 in words is "two billion, one hundred six million, six hundred twenty thousand, two hundred eighty-one".