21434400541 has 2 divisors, whose sum is σ = 21434400542. Its totient is φ = 21434400540.

The previous prime is 21434400527. The next prime is 21434400583. The reversal of 21434400541 is 14500443412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18818078041 + 2616322500 = 137179^2 + 51150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21434400541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434400041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717200270 + 10717200271.

It is an arithmetic number, because the mean of its divisors is an integer number (10717200271).

Almost surely, 2^21434400541 is an apocalyptic number.

It is an amenable number.

21434400541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434400541 is an equidigital number, since it uses as much as digits as its factorization.

21434400541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21434400541 its reverse (14500443412), we get a palindrome (35934843953).

The spelling of 21434400541 in words is "twenty-one billion, four hundred thirty-four million, four hundred thousand, five hundred forty-one".