140021421 has 8 divisors (see below), whose sum is σ = 186775200. Its totient is φ = 93307632.

The previous prime is 140021411. The next prime is 140021423. The reversal of 140021421 is 124120041.

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

It is not a de Polignac number, because 140021421 - 2¹⁹ = 139497133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140021421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140021423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550 + ... + 16743.

It is an arithmetic number, because the mean of its divisors is an integer number (23346900).

Almost surely, 2^140021421 is an apocalyptic number.

It is an amenable number.

140021421 is a deficient number, since it is larger than the sum of its proper divisors (46753779).

140021421 is a wasteful number, since it uses less digits than its factorization.

140021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19995.

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

The square root of 140021421 is about 11833.0647340408. The cubic root of 140021421 is about 519.2758917908.

Adding to 140021421 its reverse (124120041), we get a palindrome (264141462).

The spelling of 140021421 in words is "one hundred forty million, twenty-one thousand, four hundred twenty-one".