21411413200421 has 2 divisors, whose sum is σ = 21411413200422. Its totient is φ = 21411413200420.

The previous prime is 21411413200357. The next prime is 21411413200447. The reversal of 21411413200421 is 12400231411412.

It is an a-pointer prime, because the next prime (21411413200447) can be obtained adding 21411413200421 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18007716602500 + 3403696597921 = 4243550^2 + 1844911^2 .

It is a cyclic number.

It is not a de Polignac number, because 21411413200421 - 2⁶ = 21411413200357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21411413200621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705706600210 + 10705706600211.

It is an arithmetic number, because the mean of its divisors is an integer number (10705706600211).

Almost surely, 2^{21411413200421} is an apocalyptic number.

It is an amenable number.

21411413200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

21411413200421 is an equidigital number, since it uses as much as digits as its factorization.

21411413200421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 21411413200421 its reverse (12400231411412), we get a palindrome (33811644611833).

The spelling of 21411413200421 in words is "twenty-one trillion, four hundred eleven billion, four hundred thirteen million, two hundred thousand, four hundred twenty-one".