42102431 has 4 divisors (see below), whose sum is σ = 48117072. Its totient is φ = 36087792.

The previous prime is 42102427. The next prime is 42102439. The reversal of 42102431 is 13420124.

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

It is a cyclic number.

It is not a de Polignac number, because 42102431 - 2² = 42102427 is a prime.

It is a super-2 number, since 2×42102431² = 3545229392219522, 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 (42102439) 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, 3007310 + ... + 3007323.

It is an arithmetic number, because the mean of its divisors is an integer number (12029268).

Almost surely, 2^42102431 is an apocalyptic number.

42102431 is a deficient number, since it is larger than the sum of its proper divisors (6014641).

42102431 is an equidigital number, since it uses as much as digits as its factorization.

42102431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014640.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 42102431 is about 6488.6386091383. The cubic root of 42102431 is about 347.8850167312.

Adding to 42102431 its reverse (13420124), we get a palindrome (55522555).

The spelling of 42102431 in words is "forty-two million, one hundred two thousand, four hundred thirty-one".