140402221 has 4 divisors (see below), whose sum is σ = 141792444. Its totient is φ = 139012000.

The previous prime is 140402209. The next prime is 140402231. The reversal of 140402221 is 122204041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129709321 + 10692900 = 11389^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 140402221 - 2¹¹ = 140400173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140402195 and 140402204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140402231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694960 + ... + 695161.

It is an arithmetic number, because the mean of its divisors is an integer number (35448111).

Almost surely, 2^140402221 is an apocalyptic number.

It is an amenable number.

140402221 is a deficient number, since it is larger than the sum of its proper divisors (1390223).

140402221 is a wasteful number, since it uses less digits than its factorization.

140402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390222.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 140402221 is about 11849.1443150972. The cubic root of 140402221 is about 519.7462038127.

Adding to 140402221 its reverse (122204041), we get a palindrome (262606262).

It can be divided in two parts, 14040 and 2221, that added together give a palindrome (16261).

The spelling of 140402221 in words is "one hundred forty million, four hundred two thousand, two hundred twenty-one".