20021210087 has 2 divisors, whose sum is σ = 20021210088. Its totient is φ = 20021210086.

The previous prime is 20021210059. The next prime is 20021210147. The reversal of 20021210087 is 78001212002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021210087 - 2¹⁰ = 20021209063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021210057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010605043 + 10010605044.

It is an arithmetic number, because the mean of its divisors is an integer number (10010605044).

Almost surely, 2^20021210087 is an apocalyptic number.

20021210087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021210087 is an equidigital number, since it uses as much as digits as its factorization.

20021210087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 20021210087 its reverse (78001212002), we get a palindrome (98022422089).

The spelling of 20021210087 in words is "twenty billion, twenty-one million, two hundred ten thousand, eighty-seven".