20213133091 has 2 divisors, whose sum is σ = 20213133092. Its totient is φ = 20213133090.

The previous prime is 20213133089. The next prime is 20213133107. The reversal of 20213133091 is 19033131202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20213133091 - 2¹ = 20213133089 is a prime.

Together with 20213133089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20213131091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106566545 + 10106566546.

It is an arithmetic number, because the mean of its divisors is an integer number (10106566546).

Almost surely, 2^20213133091 is an apocalyptic number.

20213133091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213133091 is an equidigital number, since it uses as much as digits as its factorization.

20213133091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 20213133091 its reverse (19033131202), we get a palindrome (39246264293).

The spelling of 20213133091 in words is "twenty billion, two hundred thirteen million, one hundred thirty-three thousand, ninety-one".