21144032101 has 2 divisors, whose sum is σ = 21144032102. Its totient is φ = 21144032100.

The previous prime is 21144032087. The next prime is 21144032209. The reversal of 21144032101 is 10123044112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20163716001 + 980316100 = 141999^2 + 31310^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144032101 - 2⁵ = 21144032069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21144036101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572016050 + 10572016051.

It is an arithmetic number, because the mean of its divisors is an integer number (10572016051).

Almost surely, 2^21144032101 is an apocalyptic number.

It is an amenable number.

21144032101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144032101 is an equidigital number, since it uses as much as digits as its factorization.

21144032101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21144032101 its reverse (10123044112), we get a palindrome (31267076213).

The spelling of 21144032101 in words is "twenty-one billion, one hundred forty-four million, thirty-two thousand, one hundred one".