102420381 has 8 divisors (see below), whose sum is σ = 156069184. Its totient is φ = 58525920.

The previous prime is 102420377. The next prime is 102420389. The reversal of 102420381 is 183024201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102420381 - 2² = 102420377 is a prime.

It is a super-2 number, since 2×102420381² = 20979868888370322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 4877161 = 102420381 / (1 + 0 + 2 + 4 + 2 + 0 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102420389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2438560 + ... + 2438601.

It is an arithmetic number, because the mean of its divisors is an integer number (19508648).

Almost surely, 2^102420381 is an apocalyptic number.

It is an amenable number.

102420381 is a deficient number, since it is larger than the sum of its proper divisors (53648803).

102420381 is an equidigital number, since it uses as much as digits as its factorization.

102420381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4877171.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 102420381 is about 10120.2954996383. The cubic root of 102420381 is about 467.8738748079.

Adding to 102420381 its reverse (183024201), we get a palindrome (285444582).

The spelling of 102420381 in words is "one hundred two million, four hundred twenty thousand, three hundred eighty-one".