1221021201031 has 2 divisors, whose sum is σ = 1221021201032. Its totient is φ = 1221021201030.

The previous prime is 1221021200911. The next prime is 1221021201047. The reversal of 1221021201031 is 1301021201221.

It is an a-pointer prime, because the next prime (1221021201047) can be obtained adding 1221021201031 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221021201031 - 2¹⁷ = 1221021069959 is a prime.

It is a super-2 number, since 2×1221021201031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221021200996 and 1221021201014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221021201131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510600515 + 610510600516.

It is an arithmetic number, because the mean of its divisors is an integer number (610510600516).

Almost surely, 2^{1221021201031} is an apocalyptic number.

1221021201031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221021201031 is an equidigital number, since it uses as much as digits as its factorization.

1221021201031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221021201031 its reverse (1301021201221), we get a palindrome (2522042402252).

The spelling of 1221021201031 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred one thousand, thirty-one".