106198921 has 2 divisors, whose sum is σ = 106198922. Its totient is φ = 106198920.

The previous prime is 106198913. The next prime is 106198927. The reversal of 106198921 is 129891601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99102025 + 7096896 = 9955^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 106198921 - 2³ = 106198913 is a prime.

It is a super-2 number, since 2×106198921² = 22556421643128482, which contains 22 as substring.

It is equal to p_6097519 and since 106198921 and 6097519 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (106198927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53099460 + 53099461.

It is an arithmetic number, because the mean of its divisors is an integer number (53099461).

Almost surely, 2^106198921 is an apocalyptic number.

It is an amenable number.

106198921 is a deficient number, since it is larger than the sum of its proper divisors (1).

106198921 is an equidigital number, since it uses as much as digits as its factorization.

106198921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 106198921 is about 10305.2860707503. The cubic root of 106198921 is about 473.5582075811.

The spelling of 106198921 in words is "one hundred six million, one hundred ninety-eight thousand, nine hundred twenty-one".