21430311101 has 2 divisors, whose sum is σ = 21430311102. Its totient is φ = 21430311100.

The previous prime is 21430311079. The next prime is 21430311103. The reversal of 21430311101 is 10111303412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15794205625 + 5636105476 = 125675^2 + 75074^2 .

It is a cyclic number.

It is not a de Polignac number, because 21430311101 - 2²² = 21426116797 is a prime.

Together with 21430311103, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21430311101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21430311103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715155550 + 10715155551.

It is an arithmetic number, because the mean of its divisors is an integer number (10715155551).

Almost surely, 2^21430311101 is an apocalyptic number.

It is an amenable number.

21430311101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430311101 is an equidigital number, since it uses as much as digits as its factorization.

21430311101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21430311101 its reverse (10111303412), we get a palindrome (31541614513).

The spelling of 21430311101 in words is "twenty-one billion, four hundred thirty million, three hundred eleven thousand, one hundred one".