103142021 has 4 divisors (see below), whose sum is σ = 103199712. Its totient is φ = 103084332.

The previous prime is 103141981. The next prime is 103142027. The reversal of 103142021 is 120241301.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103142021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 103141987 and 103142005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103142027) 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, 26075 + ... + 29768.

It is an arithmetic number, because the mean of its divisors is an integer number (25799928).

Almost surely, 2^103142021 is an apocalyptic number.

It is an amenable number.

103142021 is a deficient number, since it is larger than the sum of its proper divisors (57691).

103142021 is an equidigital number, since it uses as much as digits as its factorization.

103142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57690.

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

The square root of 103142021 is about 10155.8860273243. The cubic root of 103142021 is about 468.9701625097.

Adding to 103142021 its reverse (120241301), we get a palindrome (223383322).

The spelling of 103142021 in words is "one hundred three million, one hundred forty-two thousand, twenty-one".