109902421 has 2 divisors, whose sum is σ = 109902422. Its totient is φ = 109902420.

The previous prime is 109902413. The next prime is 109902437. The reversal of 109902421 is 124209901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105801796 + 4100625 = 10286^2 + 2025^2 .

It is a cyclic number.

It is not a de Polignac number, because 109902421 - 2³ = 109902413 is a prime.

It is a super-2 number, since 2×109902421² = 24157084283322482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 109902421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109902461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54951210 + 54951211.

It is an arithmetic number, because the mean of its divisors is an integer number (54951211).

Almost surely, 2^109902421 is an apocalyptic number.

It is an amenable number.

109902421 is a deficient number, since it is larger than the sum of its proper divisors (1).

109902421 is an equidigital number, since it uses as much as digits as its factorization.

109902421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 109902421 is about 10483.4355532907. The cubic root of 109902421 is about 479.0002644106. Note that the first 3 decimals are identical.

The spelling of 109902421 in words is "one hundred nine million, nine hundred two thousand, four hundred twenty-one".