21834642901 has 2 divisors, whose sum is σ = 21834642902. Its totient is φ = 21834642900.

The previous prime is 21834642839. The next prime is 21834642917. The reversal of 21834642901 is 10924643812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21830358001 + 4284900 = 147751^2 + 2070^2 .

It is a cyclic number.

It is not a de Polignac number, because 21834642901 - 2²⁵ = 21801088469 is a prime.

It is a super-2 number, since 2×21834642901² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21834642001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917321450 + 10917321451.

It is an arithmetic number, because the mean of its divisors is an integer number (10917321451).

Almost surely, 2^21834642901 is an apocalyptic number.

It is an amenable number.

21834642901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21834642901 is an equidigital number, since it uses as much as digits as its factorization.

21834642901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 21834642901 in words is "twenty-one billion, eight hundred thirty-four million, six hundred forty-two thousand, nine hundred one".