140221731 has 32 divisors (see below), whose sum is σ = 211341312. Its totient is φ = 82051200.

The previous prime is 140221723. The next prime is 140221751. The reversal of 140221731 is 137122041.

140221731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 140221731 - 2³ = 140221723 is a prime.

It is a super-2 number, since 2×140221731² = 39324267689272722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 140221698 and 140221707.

It is not an unprimeable number, because it can be changed into a prime (140221721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199681 + ... + 200381.

It is an arithmetic number, because the mean of its divisors is an integer number (6604416).

Almost surely, 2^140221731 is an apocalyptic number.

140221731 is a deficient number, since it is larger than the sum of its proper divisors (71119581).

140221731 is a wasteful number, since it uses less digits than its factorization.

140221731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 140221731 is about 11841.5257040636. The cubic root of 140221731 is about 519.5233934274.

Adding to 140221731 its reverse (137122041), we get a palindrome (277343772).

It can be divided in two parts, 14022 and 1731, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 140221731 in words is "one hundred forty million, two hundred twenty-one thousand, seven hundred thirty-one".