21220212199867 has 2 divisors, whose sum is σ = 21220212199868. Its totient is φ = 21220212199866.

The previous prime is 21220212199847. The next prime is 21220212199873. The reversal of 21220212199867 is 76899121202212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220212199867 - 2²⁷ = 21220077982139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220212199847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610106099933 + 10610106099934.

It is an arithmetic number, because the mean of its divisors is an integer number (10610106099934).

Almost surely, 2^{21220212199867} is an apocalyptic number.

21220212199867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220212199867 is an equidigital number, since it uses as much as digits as its factorization.

21220212199867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 21220212199867 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, one hundred ninety-nine thousand, eight hundred sixty-seven".