140421961 has 4 divisors (see below), whose sum is σ = 143687632. Its totient is φ = 137156292.

The previous prime is 140421959. The next prime is 140421979. The reversal of 140421961 is 169124041.

140421961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 169124041 = 17 ⋅9948473.

It is a cyclic number.

It is not a de Polignac number, because 140421961 - 2¹ = 140421959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140421901) 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, 1632771 + ... + 1632856.

It is an arithmetic number, because the mean of its divisors is an integer number (35921908).

Almost surely, 2^140421961 is an apocalyptic number.

It is an amenable number.

140421961 is a deficient number, since it is larger than the sum of its proper divisors (3265671).

140421961 is an equidigital number, since it uses as much as digits as its factorization.

140421961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265670.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 140421961 is about 11849.9772573621. The cubic root of 140421961 is about 519.7705607618.

The spelling of 140421961 in words is "one hundred forty million, four hundred twenty-one thousand, nine hundred sixty-one".