21102814273 has 2 divisors, whose sum is σ = 21102814274. Its totient is φ = 21102814272.

The previous prime is 21102814217. The next prime is 21102814277. The reversal of 21102814273 is 37241820112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12124872769 + 8977941504 = 110113^2 + 94752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102814273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102814277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551407136 + 10551407137.

It is an arithmetic number, because the mean of its divisors is an integer number (10551407137).

Almost surely, 2^21102814273 is an apocalyptic number.

It is an amenable number.

21102814273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102814273 is an equidigital number, since it uses as much as digits as its factorization.

21102814273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The spelling of 21102814273 in words is "twenty-one billion, one hundred two million, eight hundred fourteen thousand, two hundred seventy-three".