1021212210091 has 2 divisors, whose sum is σ = 1021212210092. Its totient is φ = 1021212210090.

The previous prime is 1021212210077. The next prime is 1021212210101. The reversal of 1021212210091 is 1900122121201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021212210091 - 2¹⁹ = 1021211685803 is a prime.

It is a super-3 number, since 3×1021212210091³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1021212219091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510606105045 + 510606105046.

It is an arithmetic number, because the mean of its divisors is an integer number (510606105046).

Almost surely, 2^{1021212210091} is an apocalyptic number.

1021212210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021212210091 is an equidigital number, since it uses as much as digits as its factorization.

1021212210091 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 22.

Adding to 1021212210091 its reverse (1900122121201), we get a palindrome (2921334331292).

The spelling of 1021212210091 in words is "one trillion, twenty-one billion, two hundred twelve million, two hundred ten thousand, ninety-one".