21212020220179 has 2 divisors, whose sum is σ = 21212020220180. Its totient is φ = 21212020220178.

The previous prime is 21212020220143. The next prime is 21212020220189. The reversal of 21212020220179 is 97102202021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212020220179 - 2⁹ = 21212020219667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21212020220179.

It is not a weakly prime, because it can be changed into another prime (21212020220189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606010110089 + 10606010110090.

It is an arithmetic number, because the mean of its divisors is an integer number (10606010110090).

Almost surely, 2^{21212020220179} is an apocalyptic number.

21212020220179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212020220179 is an equidigital number, since it uses as much as digits as its factorization.

21212020220179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 21212020220179 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred twenty thousand, one hundred seventy-nine".