221101109987 has 2 divisors, whose sum is σ = 221101109988. Its totient is φ = 221101109986.

The previous prime is 221101109969. The next prime is 221101110053. The reversal of 221101109987 is 789901101122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221101109987 - 2⁶ = 221101109923 is a prime.

It is a super-2 number, since 2×221101109987² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221101109917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550554993 + 110550554994.

It is an arithmetic number, because the mean of its divisors is an integer number (110550554994).

Almost surely, 2^221101109987 is an apocalyptic number.

221101109987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221101109987 is an equidigital number, since it uses as much as digits as its factorization.

221101109987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 221101109987 in words is "two hundred twenty-one billion, one hundred one million, one hundred nine thousand, nine hundred eighty-seven".