21012220219967 has 2 divisors, whose sum is σ = 21012220219968. Its totient is φ = 21012220219966.

The previous prime is 21012220219961. The next prime is 21012220220009. The reversal of 21012220219967 is 76991202221012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012220219967 - 2¹² = 21012220215871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012220219961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506110109983 + 10506110109984.

It is an arithmetic number, because the mean of its divisors is an integer number (10506110109984).

Almost surely, 2^{21012220219967} is an apocalyptic number.

21012220219967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012220219967 is an equidigital number, since it uses as much as digits as its factorization.

21012220219967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 21012220219967 in words is "twenty-one trillion, twelve billion, two hundred twenty million, two hundred nineteen thousand, nine hundred sixty-seven".