21421410911 has 2 divisors, whose sum is σ = 21421410912. Its totient is φ = 21421410910.

The previous prime is 21421410869. The next prime is 21421410971. The reversal of 21421410911 is 11901412412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21421410911 - 2¹⁸ = 21421148767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21421410971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710705455 + 10710705456.

It is an arithmetic number, because the mean of its divisors is an integer number (10710705456).

Almost surely, 2^21421410911 is an apocalyptic number.

21421410911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421410911 is an equidigital number, since it uses as much as digits as its factorization.

21421410911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21421410911 in words is "twenty-one billion, four hundred twenty-one million, four hundred ten thousand, nine hundred eleven".