102147421 has 4 divisors (see below), whose sum is σ = 102631744. Its totient is φ = 101663100.

The previous prime is 102147413. The next prime is 102147427. The reversal of 102147421 is 124741201.

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: 124741201 = 13 ⋅9595477.

It is a cyclic number.

It is not a de Polignac number, because 102147421 - 2³ = 102147413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102147392 and 102147401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102147427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241845 + ... + 242266.

It is an arithmetic number, because the mean of its divisors is an integer number (25657936).

Almost surely, 2^102147421 is an apocalyptic number.

It is an amenable number.

102147421 is a deficient number, since it is larger than the sum of its proper divisors (484323).

102147421 is an equidigital number, since it uses as much as digits as its factorization.

102147421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484322.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 102147421 is about 10106.8007302014. The cubic root of 102147421 is about 467.4578623121.

Adding to 102147421 its reverse (124741201), we get a palindrome (226888622).

The spelling of 102147421 in words is "one hundred two million, one hundred forty-seven thousand, four hundred twenty-one".