21221933091371 has 2 divisors, whose sum is σ = 21221933091372. Its totient is φ = 21221933091370.

The previous prime is 21221933091343. The next prime is 21221933091377. The reversal of 21221933091371 is 17319033912212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221933091371 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221933091377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610966545685 + 10610966545686.

It is an arithmetic number, because the mean of its divisors is an integer number (10610966545686).

Almost surely, 2^{21221933091371} is an apocalyptic number.

21221933091371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221933091371 is an equidigital number, since it uses as much as digits as its factorization.

21221933091371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 21221933091371 in words is "twenty-one trillion, two hundred twenty-one billion, nine hundred thirty-three million, ninety-one thousand, three hundred seventy-one".