140564021 has 8 divisors (see below), whose sum is σ = 151516344. Its totient is φ = 129631680.

The previous prime is 140564009. The next prime is 140564027. The reversal of 140564021 is 120465041.

It can be written as a sum of positive squares in 4 ways, for example, as 3556996 + 137007025 = 1886^2 + 11705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 140564021 - 2¹⁴ = 140547637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140564027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11711 + ... + 20451.

It is an arithmetic number, because the mean of its divisors is an integer number (18939543).

Almost surely, 2^140564021 is an apocalyptic number.

It is an amenable number.

140564021 is a deficient number, since it is larger than the sum of its proper divisors (10952323).

140564021 is a wasteful number, since it uses less digits than its factorization.

140564021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9991.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 140564021 is about 11855.9698464529. The cubic root of 140564021 is about 519.9457796030.

The spelling of 140564021 in words is "one hundred forty million, five hundred sixty-four thousand, twenty-one".