102427421 has 2 divisors, whose sum is σ = 102427422. Its totient is φ = 102427420.

The previous prime is 102427393. The next prime is 102427427. The reversal of 102427421 is 124724201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72012196 + 30415225 = 8486^2 + 5515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102427421 is a prime.

It is a super-2 number, since 2×102427421² = 20982753145422482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102427427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51213710 + 51213711.

It is an arithmetic number, because the mean of its divisors is an integer number (51213711).

Almost surely, 2^102427421 is an apocalyptic number.

It is an amenable number.

102427421 is a deficient number, since it is larger than the sum of its proper divisors (1).

102427421 is an equidigital number, since it uses as much as digits as its factorization.

102427421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 102427421 is about 10120.6433095925. The cubic root of 102427421 is about 467.8845945383.

The spelling of 102427421 in words is "one hundred two million, four hundred twenty-seven thousand, four hundred twenty-one".