220021999991 has 2 divisors, whose sum is σ = 220021999992. Its totient is φ = 220021999990.

The previous prime is 220021999987. The next prime is 220022000053. The reversal of 220021999991 is 199999120022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220021999991 - 2² = 220021999987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220021999931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110010999995 + 110010999996.

It is an arithmetic number, because the mean of its divisors is an integer number (110010999996).

Almost surely, 2^220021999991 is an apocalyptic number.

220021999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

220021999991 is an equidigital number, since it uses as much as digits as its factorization.

220021999991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 53.

The spelling of 220021999991 in words is "two hundred twenty billion, twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-one".