140021045 has 4 divisors (see below), whose sum is σ = 168025260. Its totient is φ = 112016832.

The previous prime is 140021023. The next prime is 140021107. The reversal of 140021045 is 540120041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540120041 = 29 ⋅18624829.

It can be written as a sum of positive squares in 2 ways, for example, as 50794129 + 89226916 = 7127^2 + 9446^2 .

It is a cyclic number.

It is not a de Polignac number, because 140021045 - 2¹⁴ = 140004661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14002100 + ... + 14002109.

It is an arithmetic number, because the mean of its divisors is an integer number (42006315).

Almost surely, 2^140021045 is an apocalyptic number.

It is an amenable number.

140021045 is a deficient number, since it is larger than the sum of its proper divisors (28004215).

140021045 is an equidigital number, since it uses as much as digits as its factorization.

140021045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28004214.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 140021045 is about 11833.0488463456. The cubic root of 140021045 is about 519.2754269859.

Adding to 140021045 its reverse (540120041), we get a palindrome (680141086).

The spelling of 140021045 in words is "one hundred forty million, twenty-one thousand, forty-five".