21437106833 has 2 divisors, whose sum is σ = 21437106834. Its totient is φ = 21437106832.

The previous prime is 21437106799. The next prime is 21437106871. The reversal of 21437106833 is 33860173412.

It is an a-pointer prime, because the next prime (21437106871) can be obtained adding 21437106833 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16417809424 + 5019297409 = 128132^2 + 70847^2 .

It is a cyclic number.

It is not a de Polignac number, because 21437106833 - 2¹⁴ = 21437090449 is a prime.

It is not a weakly prime, because it can be changed into another prime (21437106133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10718553416 + 10718553417.

It is an arithmetic number, because the mean of its divisors is an integer number (10718553417).

Almost surely, 2^21437106833 is an apocalyptic number.

It is an amenable number.

21437106833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21437106833 is an equidigital number, since it uses as much as digits as its factorization.

21437106833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 21437106833 in words is "twenty-one billion, four hundred thirty-seven million, one hundred six thousand, eight hundred thirty-three".