21021033120091 has 2 divisors, whose sum is σ = 21021033120092. Its totient is φ = 21021033120090.

The previous prime is 21021033120001. The next prime is 21021033120097. The reversal of 21021033120091 is 19002133012012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21021033120091 - 2¹³ = 21021033111899 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021033120097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510516560045 + 10510516560046.

It is an arithmetic number, because the mean of its divisors is an integer number (10510516560046).

Almost surely, 2^{21021033120091} is an apocalyptic number.

21021033120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021033120091 is an equidigital number, since it uses as much as digits as its factorization.

21021033120091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21021033120091 in words is "twenty-one trillion, twenty-one billion, thirty-three million, one hundred twenty thousand, ninety-one".