140251221 has 36 divisors (see below), whose sum is σ = 230406540. Its totient is φ = 82051200.

The previous prime is 140251219. The next prime is 140251229. The reversal of 140251221 is 122152041.

It can be written as a sum of positive squares in 2 ways, for example, as 63776196 + 76475025 = 7986^2 + 8745^2 .

It is not a de Polignac number, because 140251221 - 2¹ = 140251219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 140251194 and 140251203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140251229) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 29361 + ... + 33801.

Almost surely, 2^140251221 is an apocalyptic number.

140251221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140251221 is a deficient number, since it is larger than the sum of its proper divisors (90155319).

140251221 is a wasteful number, since it uses less digits than its factorization.

140251221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4498 (or 4484 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 140251221 is about 11842.7708328752. The cubic root of 140251221 is about 519.5598111563.

The spelling of 140251221 in words is "one hundred forty million, two hundred fifty-one thousand, two hundred twenty-one".