21201133391 has 2 divisors, whose sum is σ = 21201133392. Its totient is φ = 21201133390.

The previous prime is 21201133357. The next prime is 21201133433. The reversal of 21201133391 is 19333110212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201133391 - 2³⁰ = 20127391567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201133391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201133351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600566695 + 10600566696.

It is an arithmetic number, because the mean of its divisors is an integer number (10600566696).

Almost surely, 2^21201133391 is an apocalyptic number.

21201133391 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201133391 is an equidigital number, since it uses as much as digits as its factorization.

21201133391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 21201133391 in words is "twenty-one billion, two hundred one million, one hundred thirty-three thousand, three hundred ninety-one".