21121032091 has 2 divisors, whose sum is σ = 21121032092. Its totient is φ = 21121032090.

The previous prime is 21121031993. The next prime is 21121032113. The reversal of 21121032091 is 19023012112.

It is an a-pointer prime, because the next prime (21121032113) can be obtained adding 21121032091 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121032091 - 2¹¹ = 21121030043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21121132091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560516045 + 10560516046.

It is an arithmetic number, because the mean of its divisors is an integer number (10560516046).

Almost surely, 2^21121032091 is an apocalyptic number.

21121032091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121032091 is an equidigital number, since it uses as much as digits as its factorization.

21121032091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21121032091 in words is "twenty-one billion, one hundred twenty-one million, thirty-two thousand, ninety-one".