140805021 has 8 divisors (see below), whose sum is σ = 214560064. Its totient is φ = 80460000.

The previous prime is 140805013. The next prime is 140805023. The reversal of 140805021 is 120508041.

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

It is not a de Polignac number, because 140805021 - 2³ = 140805013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 6705001 = 140805021 / (1 + 4 + 0 + 8 + 0 + 5 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140805023) 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, 3352480 + ... + 3352521.

It is an arithmetic number, because the mean of its divisors is an integer number (26820008).

Almost surely, 2^140805021 is an apocalyptic number.

It is an amenable number.

140805021 is a deficient number, since it is larger than the sum of its proper divisors (73755043).

140805021 is an equidigital number, since it uses as much as digits as its factorization.

140805021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705011.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 140805021 is about 11866.1291498112. The cubic root of 140805021 is about 520.2427626345.

The spelling of 140805021 in words is "one hundred forty million, eight hundred five thousand, twenty-one".