140442021 has 6 divisors (see below), whose sum is σ = 202860710. Its totient is φ = 93628008.

The previous prime is 140441989. The next prime is 140442037. The reversal of 140442021 is 120244041.

It can be written as a sum of positive squares in only one way, i.e., 127373796 + 13068225 = 11286^2 + 3615^2 .

It is not a de Polignac number, because 140442021 - 2⁵ = 140441989 is a prime.

It is a super-2 number, since 2×140442021² = 39447922525128882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140441985 and 140442003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140442221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7802326 + ... + 7802343.

Almost surely, 2^140442021 is an apocalyptic number.

It is an amenable number.

140442021 is a deficient number, since it is larger than the sum of its proper divisors (62418689).

140442021 is a wasteful number, since it uses less digits than its factorization.

140442021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15604675 (or 15604672 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 140442021 is about 11850.8236422622. The cubic root of 140442021 is about 519.7953102168.

Adding to 140442021 its reverse (120244041), we get a palindrome (260686062).

The spelling of 140442021 in words is "one hundred forty million, four hundred forty-two thousand, twenty-one".