106155421 has 2 divisors, whose sum is σ = 106155422. Its totient is φ = 106155420.

The previous prime is 106155383. The next prime is 106155431. The reversal of 106155421 is 124551601.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98287396 + 7868025 = 9914^2 + 2805^2 .

It is a cyclic number.

It is not a de Polignac number, because 106155421 - 2¹⁷ = 106024349 is a prime.

It is a super-2 number, since 2×106155421² = 22537946815374482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106155431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53077710 + 53077711.

It is an arithmetic number, because the mean of its divisors is an integer number (53077711).

Almost surely, 2^106155421 is an apocalyptic number.

It is an amenable number.

106155421 is a deficient number, since it is larger than the sum of its proper divisors (1).

106155421 is an equidigital number, since it uses as much as digits as its factorization.

106155421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 106155421 is about 10303.1752872597. The cubic root of 106155421 is about 473.4935409000.

The spelling of 106155421 in words is "one hundred six million, one hundred fifty-five thousand, four hundred twenty-one".