10102421 has 4 divisors (see below), whose sum is σ = 11545632. Its totient is φ = 8659212.

The previous prime is 10102387. The next prime is 10102423. The reversal of 10102421 is 12420101.

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: 12420101 = 71 ⋅174931.

It is a cyclic number.

It is not a de Polignac number, because 10102421 - 2¹⁰ = 10101397 is a prime.

It is a super-2 number, since 2×10102421² = 204117820122482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10102423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721595 + ... + 721608.

It is an arithmetic number, because the mean of its divisors is an integer number (2886408).

Almost surely, 2^10102421 is an apocalyptic number.

It is an amenable number.

10102421 is a deficient number, since it is larger than the sum of its proper divisors (1443211).

10102421 is an equidigital number, since it uses as much as digits as its factorization.

10102421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443210.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 10102421 is about 3178.4305875699. The cubic root of 10102421 is about 216.1765032515.

Adding to 10102421 its reverse (12420101), we get a palindrome (22522522).

The spelling of 10102421 in words is "ten million, one hundred two thousand, four hundred twenty-one".