22155220001 has 2 divisors, whose sum is σ = 22155220002. Its totient is φ = 22155220000.

The previous prime is 22155219997. The next prime is 22155220013. The reversal of 22155220001 is 10002255122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21850752400 + 304467601 = 147820^2 + 17449^2 .

It is a cyclic number.

It is not a de Polignac number, because 22155220001 - 2² = 22155219997 is a prime.

It is not a weakly prime, because it can be changed into another prime (22155220081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11077610000 + 11077610001.

It is an arithmetic number, because the mean of its divisors is an integer number (11077610001).

Almost surely, 2^22155220001 is an apocalyptic number.

It is an amenable number.

22155220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

22155220001 is an equidigital number, since it uses as much as digits as its factorization.

22155220001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 22155220001 its reverse (10002255122), we get a palindrome (32157475123).

The spelling of 22155220001 in words is "twenty-two billion, one hundred fifty-five million, two hundred twenty thousand, one".