10221221120987 has 2 divisors, whose sum is σ = 10221221120988. Its totient is φ = 10221221120986.

The previous prime is 10221221120951. The next prime is 10221221121103. The reversal of 10221221120987 is 78902112212201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10221221120987 - 2³⁶ = 10152501644251 is a prime.

It is a super-2 number, since 2×10221221120987² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10221221120987.

It is not a weakly prime, because it can be changed into another prime (10221221120917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110610560493 + 5110610560494.

It is an arithmetic number, because the mean of its divisors is an integer number (5110610560494).

Almost surely, 2^{10221221120987} is an apocalyptic number.

10221221120987 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221221120987 is an equidigital number, since it uses as much as digits as its factorization.

10221221120987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 10221221120987 in words is "ten trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, nine hundred eighty-seven".