22121201 has 2 divisors, whose sum is σ = 22121202. Its totient is φ = 22121200.

The previous prime is 22121191. The next prime is 22121213. The reversal of 22121201 is 10212122.

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., 15366400 + 6754801 = 3920^2 + 2599^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121201 - 2⁶ = 22121137 is a prime.

It is not a weakly prime, because it can be changed into another prime (22141201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060600 + 11060601.

It is an arithmetic number, because the mean of its divisors is an integer number (11060601).

Almost surely, 2^22121201 is an apocalyptic number.

It is an amenable number.

22121201 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121201 is an equidigital number, since it uses as much as digits as its factorization.

22121201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 22121201 is about 4703.3180840764. The cubic root of 22121201 is about 280.7175515779.

Adding to 22121201 its reverse (10212122), we get a palindrome (32333323).

It can be divided in two parts, 22121 and 201, that added together give a palindrome (22322).

The spelling of 22121201 in words is "twenty-two million, one hundred twenty-one thousand, two hundred one".