221022031987 has 2 divisors, whose sum is σ = 221022031988. Its totient is φ = 221022031986.

The previous prime is 221022031981. The next prime is 221022032003. The reversal of 221022031987 is 789130220122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221022031987 is a prime.

It is not a weakly prime, because it can be changed into another prime (221022031981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110511015993 + 110511015994.

It is an arithmetic number, because the mean of its divisors is an integer number (110511015994).

Almost surely, 2^221022031987 is an apocalyptic number.

221022031987 is a deficient number, since it is larger than the sum of its proper divisors (1).

221022031987 is an equidigital number, since it uses as much as digits as its factorization.

221022031987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 221022031987 in words is "two hundred twenty-one billion, twenty-two million, thirty-one thousand, nine hundred eighty-seven".