1221411003251 has 2 divisors, whose sum is σ = 1221411003252. Its totient is φ = 1221411003250.

The previous prime is 1221411003247. The next prime is 1221411003269. The reversal of 1221411003251 is 1523001141221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221411003251 - 2² = 1221411003247 is a prime.

It is a super-2 number, since 2×1221411003251² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221411903251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610705501625 + 610705501626.

It is an arithmetic number, because the mean of its divisors is an integer number (610705501626).

Almost surely, 2^{1221411003251} is an apocalyptic number.

1221411003251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221411003251 is an equidigital number, since it uses as much as digits as its factorization.

1221411003251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 1221411003251 its reverse (1523001141221), we get a palindrome (2744412144472).

The spelling of 1221411003251 in words is "one trillion, two hundred twenty-one billion, four hundred eleven million, three thousand, two hundred fifty-one".