106408021 has 2 divisors, whose sum is σ = 106408022. Its totient is φ = 106408020.

The previous prime is 106408019. The next prime is 106408063. The reversal of 106408021 is 120804601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82992100 + 23415921 = 9110^2 + 4839^2 .

It is a cyclic number.

It is not a de Polignac number, because 106408021 - 2¹ = 106408019 is a prime.

It is a super-2 number, since 2×106408021² = 22645333866272882, which contains 22 as substring.

Together with 106408019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 106407983 and 106408001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106408091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53204010 + 53204011.

It is an arithmetic number, because the mean of its divisors is an integer number (53204011).

Almost surely, 2^106408021 is an apocalyptic number.

It is an amenable number.

106408021 is a deficient number, since it is larger than the sum of its proper divisors (1).

106408021 is an equidigital number, since it uses as much as digits as its factorization.

106408021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 106408021 is about 10315.4263605534. The cubic root of 106408021 is about 473.8688074197.

The spelling of 106408021 in words is "one hundred six million, four hundred eight thousand, twenty-one".