21400214453 has 2 divisors, whose sum is σ = 21400214454. Its totient is φ = 21400214452.

The previous prime is 21400214419. The next prime is 21400214497. The reversal of 21400214453 is 35441200412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11634426769 + 9765787684 = 107863^2 + 98822^2 .

It is a cyclic number.

It is not a de Polignac number, because 21400214453 - 2¹⁴ = 21400198069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21400214753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700107226 + 10700107227.

It is an arithmetic number, because the mean of its divisors is an integer number (10700107227).

Almost surely, 2^21400214453 is an apocalyptic number.

It is an amenable number.

21400214453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400214453 is an equidigital number, since it uses as much as digits as its factorization.

21400214453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21400214453 its reverse (35441200412), we get a palindrome (56841414865).

The spelling of 21400214453 in words is "twenty-one billion, four hundred million, two hundred fourteen thousand, four hundred fifty-three".