102421797 has 4 divisors (see below), whose sum is σ = 136562400. Its totient is φ = 68281196.

The previous prime is 102421793. The next prime is 102421843. The reversal of 102421797 is 797124201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 797124201 = 3 ⋅265708067.

It is a cyclic number.

It is not a de Polignac number, because 102421797 - 2² = 102421793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102421793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17070297 + ... + 17070302.

It is an arithmetic number, because the mean of its divisors is an integer number (34140600).

Almost surely, 2^102421797 is an apocalyptic number.

It is an amenable number.

102421797 is a deficient number, since it is larger than the sum of its proper divisors (34140603).

102421797 is an equidigital number, since it uses as much as digits as its factorization.

102421797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34140602.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 102421797 is about 10120.3654578281. The cubic root of 102421797 is about 467.8760309750.

Adding to 102421797 its reverse (797124201), we get a palindrome (899545998).

The spelling of 102421797 in words is "one hundred two million, four hundred twenty-one thousand, seven hundred ninety-seven".