1221002020127 has 2 divisors, whose sum is σ = 1221002020128. Its totient is φ = 1221002020126.

The previous prime is 1221002020103. The next prime is 1221002020177. The reversal of 1221002020127 is 7210202001221.

It is a weak prime.

It is an emirp because it is prime and its reverse (7210202001221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221002020127 - 2⁸ = 1221002019871 is a prime.

It is a super-2 number, since 2×1221002020127² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221002020099 and 1221002020108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221002020177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501010063 + 610501010064.

It is an arithmetic number, because the mean of its divisors is an integer number (610501010064).

Almost surely, 2^{1221002020127} is an apocalyptic number.

1221002020127 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002020127 is an equidigital number, since it uses as much as digits as its factorization.

1221002020127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 1221002020127 its reverse (7210202001221), we get a palindrome (8431204021348).

The spelling of 1221002020127 in words is "one trillion, two hundred twenty-one billion, two million, twenty thousand, one hundred twenty-seven".