21212011102091 has 2 divisors, whose sum is σ = 21212011102092. Its totient is φ = 21212011102090.

The previous prime is 21212011102063. The next prime is 21212011102103. The reversal of 21212011102091 is 19020111021212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212011102091 - 2²² = 21212006907787 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21212011102021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606005551045 + 10606005551046.

It is an arithmetic number, because the mean of its divisors is an integer number (10606005551046).

Almost surely, 2^{21212011102091} is an apocalyptic number.

21212011102091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212011102091 is an equidigital number, since it uses as much as digits as its factorization.

21212011102091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 21212011102091 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one hundred two thousand, ninety-one".