21021200122079 has 2 divisors, whose sum is σ = 21021200122080. Its totient is φ = 21021200122078.

The previous prime is 21021200122003. The next prime is 21021200122121. The reversal of 21021200122079 is 97022100212012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021200122079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021200122379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510600061039 + 10510600061040.

It is an arithmetic number, because the mean of its divisors is an integer number (10510600061040).

Almost surely, 2^{21021200122079} is an apocalyptic number.

21021200122079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021200122079 is an equidigital number, since it uses as much as digits as its factorization.

21021200122079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 21021200122079 in words is "twenty-one trillion, twenty-one billion, two hundred million, one hundred twenty-two thousand, seventy-nine".