11021200221991 has 2 divisors, whose sum is σ = 11021200221992. Its totient is φ = 11021200221990.

The previous prime is 11021200221961. The next prime is 11021200222049. The reversal of 11021200221991 is 19912200212011.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11021200221991 - 2⁵ = 11021200221959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021200221961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510600110995 + 5510600110996.

It is an arithmetic number, because the mean of its divisors is an integer number (5510600110996).

Almost surely, 2^{11021200221991} is an apocalyptic number.

11021200221991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021200221991 is an equidigital number, since it uses as much as digits as its factorization.

11021200221991 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 31.

The spelling of 11021200221991 in words is "eleven trillion, twenty-one billion, two hundred million, two hundred twenty-one thousand, nine hundred ninety-one".