140242421 has 4 divisors (see below), whose sum is σ = 152991744. Its totient is φ = 127493100.

The previous prime is 140242411. The next prime is 140242423. The reversal of 140242421 is 124242041.

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 not a de Polignac number, because 140242421 - 2¹⁰ = 140241397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140242393 and 140242402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140242423) 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, 6374645 + ... + 6374666.

It is an arithmetic number, because the mean of its divisors is an integer number (38247936).

Almost surely, 2^140242421 is an apocalyptic number.

140242421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140242421 is a deficient number, since it is larger than the sum of its proper divisors (12749323).

140242421 is a wasteful number, since it uses less digits than its factorization.

140242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12749322.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 140242421 is about 11842.3992923731. The cubic root of 140242421 is about 519.5489444132.

Adding to 140242421 its reverse (124242041), we get a palindrome (264484462).

The spelling of 140242421 in words is "one hundred forty million, two hundred forty-two thousand, four hundred twenty-one".