22081387 has 2 divisors, whose sum is σ = 22081388. Its totient is φ = 22081386.

The previous prime is 22081373. The next prime is 22081429. The reversal of 22081387 is 78318022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22081387 - 2¹⁹ = 21557099 is a prime.

It is not a weakly prime, because it can be changed into another prime (22081187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11040693 + 11040694.

It is an arithmetic number, because the mean of its divisors is an integer number (11040694).

Almost surely, 2^22081387 is an apocalyptic number.

22081387 is a deficient number, since it is larger than the sum of its proper divisors (1).

22081387 is an equidigital number, since it uses as much as digits as its factorization.

22081387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 22081387 is about 4699.0836340716. The cubic root of 22081387 is about 280.5490375130.

It can be divided in two parts, 220813 and 87, that added together give a square (220900 = 470²).

The spelling of 22081387 in words is "twenty-two million, eighty-one thousand, three hundred eighty-seven".