140661221 has 4 divisors (see below), whose sum is σ = 140815200. Its totient is φ = 140507244.

The previous prime is 140661197. The next prime is 140661253. The reversal of 140661221 is 122166041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122166041 = 23 ⋅5311567.

It is a cyclic number.

It is not a de Polignac number, because 140661221 - 2²² = 136466917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140661421) 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, 75611 + ... + 77448.

It is an arithmetic number, because the mean of its divisors is an integer number (35203800).

Almost surely, 2^140661221 is an apocalyptic number.

It is an amenable number.

140661221 is a deficient number, since it is larger than the sum of its proper divisors (153979).

140661221 is an equidigital number, since it uses as much as digits as its factorization.

140661221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153978.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 140661221 is about 11860.0683387576. The cubic root of 140661221 is about 520.0655994657.

The spelling of 140661221 in words is "one hundred forty million, six hundred sixty-one thousand, two hundred twenty-one".