21103244453 has 2 divisors, whose sum is σ = 21103244454. Its totient is φ = 21103244452.

The previous prime is 21103244363. The next prime is 21103244471. The reversal of 21103244453 is 35444230112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20879383009 + 223861444 = 144497^2 + 14962^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103244453 - 2¹² = 21103240357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103244053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551622226 + 10551622227.

It is an arithmetic number, because the mean of its divisors is an integer number (10551622227).

Almost surely, 2^21103244453 is an apocalyptic number.

It is an amenable number.

21103244453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103244453 is an equidigital number, since it uses as much as digits as its factorization.

21103244453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21103244453 its reverse (35444230112), we get a palindrome (56547474565).

The spelling of 21103244453 in words is "twenty-one billion, one hundred three million, two hundred forty-four thousand, four hundred fifty-three".