202012011021091 has 2 divisors, whose sum is σ = 202012011021092. Its totient is φ = 202012011021090.

The previous prime is 202012011021089. The next prime is 202012011021133. The reversal of 202012011021091 is 190120110210202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 202012011021091 - 2¹ = 202012011021089 is a prime.

Together with 202012011021089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (202012011021791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101006005510545 + 101006005510546.

It is an arithmetic number, because the mean of its divisors is an integer number (101006005510546).

Almost surely, 2^{202012011021091} is an apocalyptic number.

202012011021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

202012011021091 is an equidigital number, since it uses as much as digits as its factorization.

202012011021091 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 202012011021091 its reverse (190120110210202), we get a palindrome (392132121231293).

The spelling of 202012011021091 in words is "two hundred two trillion, twelve billion, eleven million, twenty-one thousand, ninety-one".