102120431 has 4 divisors (see below), whose sum is σ = 116709072. Its totient is φ = 87531792.

The previous prime is 102120371. The next prime is 102120433. The reversal of 102120431 is 134021201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102120431 is a prime.

It is a super-2 number, since 2×102120431² = 20857164855251522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7294310 + ... + 7294323.

It is an arithmetic number, because the mean of its divisors is an integer number (29177268).

Almost surely, 2^102120431 is an apocalyptic number.

102120431 is a deficient number, since it is larger than the sum of its proper divisors (14588641).

102120431 is an equidigital number, since it uses as much as digits as its factorization.

102120431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14588640.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 102120431 is about 10105.4654024444. The cubic root of 102120431 is about 467.4166871851.

Adding to 102120431 its reverse (134021201), we get a palindrome (236141632).

The spelling of 102120431 in words is "one hundred two million, one hundred twenty thousand, four hundred thirty-one".