140212321 has 4 divisors (see below), whose sum is σ = 141453252. Its totient is φ = 138971392.

The previous prime is 140212283. The next prime is 140212337. The reversal of 140212321 is 123212041.

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 54390625 + 85821696 = 7375^2 + 9264^2 .

It is a cyclic number.

It is not a de Polignac number, because 140212321 - 2¹⁵ = 140179553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140212295 and 140212304.

It is not an unprimeable number, because it can be changed into a prime (140212021) 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 3 ways as a sum of consecutive naturals, for example, 620296 + ... + 620521.

It is an arithmetic number, because the mean of its divisors is an integer number (35363313).

Almost surely, 2^140212321 is an apocalyptic number.

It is an amenable number.

140212321 is a deficient number, since it is larger than the sum of its proper divisors (1240931).

140212321 is a wasteful number, since it uses less digits than its factorization.

140212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240930.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 140212321 is about 11841.1283668407. The cubic root of 140212321 is about 519.5117717754.

Adding to 140212321 its reverse (123212041), we get a palindrome (263424362).

The spelling of 140212321 in words is "one hundred forty million, two hundred twelve thousand, three hundred twenty-one".