20102209987 has 2 divisors, whose sum is σ = 20102209988. Its totient is φ = 20102209986.

The previous prime is 20102209979. The next prime is 20102209991. The reversal of 20102209987 is 78990220102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20102209987 - 2³ = 20102209979 is a prime.

It is a super-2 number, since 2×20102209987² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20102269987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051104993 + 10051104994.

It is an arithmetic number, because the mean of its divisors is an integer number (10051104994).

Almost surely, 2^20102209987 is an apocalyptic number.

20102209987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102209987 is an equidigital number, since it uses as much as digits as its factorization.

20102209987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 20102209987 in words is "twenty billion, one hundred two million, two hundred nine thousand, nine hundred eighty-seven".