22120381 has 2 divisors, whose sum is σ = 22120382. Its totient is φ = 22120380.

The previous prime is 22120367. The next prime is 22120393. The reversal of 22120381 is 18302122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 3276100 = 4341^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 22120381 - 2⁷ = 22120253 is a prime.

It is a super-2 number, since 2×22120381² = 978622511170322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22120331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060190 + 11060191.

It is an arithmetic number, because the mean of its divisors is an integer number (11060191).

Almost surely, 2^22120381 is an apocalyptic number.

It is an amenable number.

22120381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22120381 is an equidigital number, since it uses as much as digits as its factorization.

22120381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 22120381 is about 4703.2309107676. The cubic root of 22120381 is about 280.7140829411.

It can be divided in two parts, 221 and 20381, that added together give a palindrome (20602).

The spelling of 22120381 in words is "twenty-two million, one hundred twenty thousand, three hundred eighty-one".