21145646434999 has 2 divisors, whose sum is σ = 21145646435000. Its totient is φ = 21145646434998.

The previous prime is 21145646434973. The next prime is 21145646435021. The reversal of 21145646434999 is 99943464654112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21145646434999 - 2⁵ = 21145646434967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145646434499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572823217499 + 10572823217500.

It is an arithmetic number, because the mean of its divisors is an integer number (10572823217500).

Almost surely, 2^{21145646434999} is an apocalyptic number.

21145646434999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145646434999 is an equidigital number, since it uses as much as digits as its factorization.

21145646434999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201553920, while the sum is 67.

The spelling of 21145646434999 in words is "twenty-one trillion, one hundred forty-five billion, six hundred forty-six million, four hundred thirty-four thousand, nine hundred ninety-nine".