21726106711633 has 2 divisors, whose sum is σ = 21726106711634. Its totient is φ = 21726106711632.

The previous prime is 21726106711591. The next prime is 21726106711679. The reversal of 21726106711633 is 33611760162712.

It is a happy number.

It is an a-pointer prime, because the next prime (21726106711679) can be obtained adding 21726106711633 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21039358049424 + 686748662209 = 4586868^2 + 828703^2 .

It is a cyclic number.

It is not a de Polignac number, because 21726106711633 - 2⁴¹ = 19527083456081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21726106712633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10863053355816 + 10863053355817.

It is an arithmetic number, because the mean of its divisors is an integer number (10863053355817).

Almost surely, 2^{21726106711633} is an apocalyptic number.

It is an amenable number.

21726106711633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21726106711633 is an equidigital number, since it uses as much as digits as its factorization.

21726106711633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 21726106711633 in words is "twenty-one trillion, seven hundred twenty-six billion, one hundred six million, seven hundred eleven thousand, six hundred thirty-three".