1231232021291 has 2 divisors, whose sum is σ = 1231232021292. Its totient is φ = 1231232021290.

The previous prime is 1231232021273. The next prime is 1231232021293. The reversal of 1231232021291 is 1921202321321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231232021291 - 2³⁴ = 1214052152107 is a prime.

Together with 1231232021293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1231232021293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615616010645 + 615616010646.

It is an arithmetic number, because the mean of its divisors is an integer number (615616010646).

Almost surely, 2^{1231232021291} is an apocalyptic number.

1231232021291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231232021291 is an equidigital number, since it uses as much as digits as its factorization.

1231232021291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 1231232021291 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-two million, twenty-one thousand, two hundred ninety-one".