222012121210021 has 2 divisors, whose sum is σ = 222012121210022. Its totient is φ = 222012121210020.

The previous prime is 222012121209929. The next prime is 222012121210031. The reversal of 222012121210021 is 120012121210222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136630640365921 + 85381480844100 = 11688911^2 + 9240210^2 .

It is a cyclic number.

It is not a de Polignac number, because 222012121210021 - 2²¹ = 222012119112869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222012121210031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111006060605010 + 111006060605011.

It is an arithmetic number, because the mean of its divisors is an integer number (111006060605011).

Almost surely, 2^{222012121210021} is an apocalyptic number.

It is an amenable number.

222012121210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222012121210021 is an equidigital number, since it uses as much as digits as its factorization.

222012121210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 222012121210021 its reverse (120012121210222), we get a palindrome (342024242420243).

The spelling of 222012121210021 in words is "two hundred twenty-two trillion, twelve billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".