1021221001291 has 2 divisors, whose sum is σ = 1021221001292. Its totient is φ = 1021221001290.

The previous prime is 1021221001253. The next prime is 1021221001327. The reversal of 1021221001291 is 1921001221201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021221001291 - 2²³ = 1021212612683 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021221004291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610500645 + 510610500646.

It is an arithmetic number, because the mean of its divisors is an integer number (510610500646).

Almost surely, 2^{1021221001291} is an apocalyptic number.

1021221001291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221001291 is an equidigital number, since it uses as much as digits as its factorization.

1021221001291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 1021221001291 its reverse (1921001221201), we get a palindrome (2942222222492).

The spelling of 1021221001291 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one thousand, two hundred ninety-one".