22541021381 has 2 divisors, whose sum is σ = 22541021382. Its totient is φ = 22541021380.

The previous prime is 22541021309. The next prime is 22541021389. The reversal of 22541021381 is 18312014522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21834790756 + 706230625 = 147766^2 + 26575^2 .

It is a cyclic number.

It is not a de Polignac number, because 22541021381 - 2¹⁰ = 22541020357 is a prime.

It is a super-2 number, since 2×22541021381² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22541021389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11270510690 + 11270510691.

It is an arithmetic number, because the mean of its divisors is an integer number (11270510691).

Almost surely, 2^22541021381 is an apocalyptic number.

It is an amenable number.

22541021381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22541021381 is an equidigital number, since it uses as much as digits as its factorization.

22541021381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 22541021381 in words is "twenty-two billion, five hundred forty-one million, twenty-one thousand, three hundred eighty-one".