20212021099 has 2 divisors, whose sum is σ = 20212021100. Its totient is φ = 20212021098.

The previous prime is 20212021097. The next prime is 20212021133. The reversal of 20212021099 is 99012021202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20212021099 - 2¹ = 20212021097 is a prime.

Together with 20212021097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20212021091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106010549 + 10106010550.

It is an arithmetic number, because the mean of its divisors is an integer number (10106010550).

Almost surely, 2^20212021099 is an apocalyptic number.

20212021099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212021099 is an equidigital number, since it uses as much as digits as its factorization.

20212021099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 20212021099 in words is "twenty billion, two hundred twelve million, twenty-one thousand, ninety-nine".