221101211087 has 2 divisors, whose sum is σ = 221101211088. Its totient is φ = 221101211086.

The previous prime is 221101211077. The next prime is 221101211101. The reversal of 221101211087 is 780112101122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221101211087 - 2²⁰ = 221100162511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221101211057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550605543 + 110550605544.

It is an arithmetic number, because the mean of its divisors is an integer number (110550605544).

Almost surely, 2^221101211087 is an apocalyptic number.

221101211087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221101211087 is an equidigital number, since it uses as much as digits as its factorization.

221101211087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 26.

The spelling of 221101211087 in words is "two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, eighty-seven".