21661032114973 has 2 divisors, whose sum is σ = 21661032114974. Its totient is φ = 21661032114972.

The previous prime is 21661032114971. The next prime is 21661032115027. The reversal of 21661032114973 is 37941123016612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16102579891204 + 5558452223769 = 4012802^2 + 2357637^2 .

It is a cyclic number.

It is not a de Polignac number, because 21661032114973 - 2¹ = 21661032114971 is a prime.

Together with 21661032114971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21661032114971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830516057486 + 10830516057487.

It is an arithmetic number, because the mean of its divisors is an integer number (10830516057487).

Almost surely, 2^{21661032114973} is an apocalyptic number.

It is an amenable number.

21661032114973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21661032114973 is an equidigital number, since it uses as much as digits as its factorization.

21661032114973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 21661032114973 in words is "twenty-one trillion, six hundred sixty-one billion, thirty-two million, one hundred fourteen thousand, nine hundred seventy-three".