106421906 has 8 divisors (see below), whose sum is σ = 159702204. Its totient is φ = 53187840.

The previous prime is 106421891. The next prime is 106421923. The reversal of 106421906 is 609124601.

It can be written as a sum of positive squares in 2 ways, for example, as 104755225 + 1666681 = 10235^2 + 1291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×106421906² = 22651244153345672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5075 + ... + 15446.

Almost surely, 2^106421906 is an apocalyptic number.

106421906 is a deficient number, since it is larger than the sum of its proper divisors (53280298).

106421906 is a wasteful number, since it uses less digits than its factorization.

106421906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23116.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 106421906 is about 10316.0993597386. The cubic root of 106421906 is about 473.8894179657.

The spelling of 106421906 in words is "one hundred six million, four hundred twenty-one thousand, nine hundred six".