140221631 has 4 divisors (see below), whose sum is σ = 152969064. Its totient is φ = 127474200.

The previous prime is 140221621. The next prime is 140221637. The reversal of 140221631 is 136122041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136122041 = 11 ⋅12374731.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140221631 is a prime.

It is a super-2 number, since 2×140221631² = 39324211600600322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140221637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6373700 + ... + 6373721.

It is an arithmetic number, because the mean of its divisors is an integer number (38242266).

Almost surely, 2^140221631 is an apocalyptic number.

140221631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

140221631 is a deficient number, since it is larger than the sum of its proper divisors (12747433).

140221631 is a wasteful number, since it uses less digits than its factorization.

140221631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12747432.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 140221631 is about 11841.5214816340. The cubic root of 140221631 is about 519.5232699269.

Adding to 140221631 its reverse (136122041), we get a palindrome (276343672).

The spelling of 140221631 in words is "one hundred forty million, two hundred twenty-one thousand, six hundred thirty-one".