106251221 has 4 divisors (see below), whose sum is σ = 106409772. Its totient is φ = 106092672.

The previous prime is 106251217. The next prime is 106251239. The reversal of 106251221 is 122152601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122152601 = 6883 ⋅17747.

It can be written as a sum of positive squares in 2 ways, for example, as 39828721 + 66422500 = 6311^2 + 8150^2 .

It is a cyclic number.

It is not a de Polignac number, because 106251221 - 2² = 106251217 is a prime.

It is a super-2 number, since 2×106251221² = 22578643927981682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 106251193 and 106251202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106251251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78266 + ... + 79611.

It is an arithmetic number, because the mean of its divisors is an integer number (26602443).

Almost surely, 2^106251221 is an apocalyptic number.

It is an amenable number.

106251221 is a deficient number, since it is larger than the sum of its proper divisors (158551).

106251221 is an equidigital number, since it uses as much as digits as its factorization.

106251221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158550.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 106251221 is about 10307.8232910736. The cubic root of 106251221 is about 473.6359328833.

The spelling of 106251221 in words is "one hundred six million, two hundred fifty-one thousand, two hundred twenty-one".