21022212019987 has 2 divisors, whose sum is σ = 21022212019988. Its totient is φ = 21022212019986.

The previous prime is 21022212019943. The next prime is 21022212019993. The reversal of 21022212019987 is 78991021222012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022212019987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022212019927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511106009993 + 10511106009994.

It is an arithmetic number, because the mean of its divisors is an integer number (10511106009994).

Almost surely, 2^{21022212019987} is an apocalyptic number.

21022212019987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022212019987 is an equidigital number, since it uses as much as digits as its factorization.

21022212019987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 21022212019987 in words is "twenty-one trillion, twenty-two billion, two hundred twelve million, nineteen thousand, nine hundred eighty-seven".