222002012001821 has 2 divisors, whose sum is σ = 222002012001822. Its totient is φ = 222002012001820.

The previous prime is 222002012001817. The next prime is 222002012001829. The reversal of 222002012001821 is 128100210200222.

It is a happy number.

222002012001821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125726569881796 + 96275442120025 = 11212786^2 + 9812005^2 .

It is a cyclic number.

It is not a de Polignac number, because 222002012001821 - 2² = 222002012001817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222002012001829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111001006000910 + 111001006000911.

It is an arithmetic number, because the mean of its divisors is an integer number (111001006000911).

Almost surely, 2^{222002012001821} is an apocalyptic number.

It is an amenable number.

222002012001821 is a deficient number, since it is larger than the sum of its proper divisors (1).

222002012001821 is an equidigital number, since it uses as much as digits as its factorization.

222002012001821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

The spelling of 222002012001821 in words is "two hundred twenty-two trillion, two billion, twelve million, one thousand, eight hundred twenty-one".