21213301993811 has 2 divisors, whose sum is σ = 21213301993812. Its totient is φ = 21213301993810.

The previous prime is 21213301993711. The next prime is 21213301993831. The reversal of 21213301993811 is 11839910331212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21213301993811 - 2¹⁰ = 21213301992787 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213301993831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606650996905 + 10606650996906.

It is an arithmetic number, because the mean of its divisors is an integer number (10606650996906).

Almost surely, 2^{21213301993811} is an apocalyptic number.

21213301993811 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213301993811 is an equidigital number, since it uses as much as digits as its factorization.

21213301993811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 21213301993811 in words is "twenty-one trillion, two hundred thirteen billion, three hundred one million, nine hundred ninety-three thousand, eight hundred eleven".