20021212019987 has 2 divisors, whose sum is σ = 20021212019988. Its totient is φ = 20021212019986.

The previous prime is 20021212019983. The next prime is 20021212020037. The reversal of 20021212019987 is 78991021212002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021212019987 - 2² = 20021212019983 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021212019983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010606009993 + 10010606009994.

It is an arithmetic number, because the mean of its divisors is an integer number (10010606009994).

Almost surely, 2^{20021212019987} is an apocalyptic number.

20021212019987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021212019987 is an equidigital number, since it uses as much as digits as its factorization.

20021212019987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 20021212019987 in words is "twenty trillion, twenty-one billion, two hundred twelve million, nineteen thousand, nine hundred eighty-seven".