140421021 has 8 divisors (see below), whose sum is σ = 201630240. Its totient is φ = 86412912.

The previous prime is 140420993. The next prime is 140421053. The reversal of 140421021 is 120124041.

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

It is not a de Polignac number, because 140421021 - 2⁷ = 140420893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140423021) 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, 1800231 + ... + 1800308.

It is an arithmetic number, because the mean of its divisors is an integer number (25203780).

Almost surely, 2^140421021 is an apocalyptic number.

It is an amenable number.

140421021 is a deficient number, since it is larger than the sum of its proper divisors (61209219).

140421021 is a wasteful number, since it uses less digits than its factorization.

140421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600555.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 140421021 is about 11849.9375947724. The cubic root of 140421021 is about 519.7694009589.

Adding to 140421021 its reverse (120124041), we get a palindrome (260545062).

The spelling of 140421021 in words is "one hundred forty million, four hundred twenty-one thousand, twenty-one".