72140221 has 2 divisors, whose sum is σ = 72140222. Its totient is φ = 72140220.

The previous prime is 72140203. The next prime is 72140239. The reversal of 72140221 is 12204127.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (72140203) and next prime (72140239).

It can be written as a sum of positive squares in only one way, i.e., 57927321 + 14212900 = 7611^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 72140221 - 2¹³ = 72132029 is a prime.

It is a super-2 number, since 2×72140221² = 10408422971857682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72140251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36070110 + 36070111.

It is an arithmetic number, because the mean of its divisors is an integer number (36070111).

Almost surely, 2^72140221 is an apocalyptic number.

It is an amenable number.

72140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

72140221 is an equidigital number, since it uses as much as digits as its factorization.

72140221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 72140221 is about 8493.5399569320. The cubic root of 72140221 is about 416.2866556230.

Adding to 72140221 its reverse (12204127), we get a palindrome (84344348).

It can be divided in two parts, 72140 and 221, that added together give a square (72361 = 269²).

The spelling of 72140221 in words is "seventy-two million, one hundred forty thousand, two hundred twenty-one".