21211202202079 has 2 divisors, whose sum is σ = 21211202202080. Its totient is φ = 21211202202078.

The previous prime is 21211202201999. The next prime is 21211202202101. The reversal of 21211202202079 is 97020220211212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211202202079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211202202079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211202232079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605601101039 + 10605601101040.

It is an arithmetic number, because the mean of its divisors is an integer number (10605601101040).

Almost surely, 2^{21211202202079} is an apocalyptic number.

21211202202079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211202202079 is an equidigital number, since it uses as much as digits as its factorization.

21211202202079 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 21211202202079 in words is "twenty-one trillion, two hundred eleven billion, two hundred two million, two hundred two thousand, seventy-nine".