1220000405251 has 2 divisors, whose sum is σ = 1220000405252. Its totient is φ = 1220000405250.

The previous prime is 1220000405243. The next prime is 1220000405303. The reversal of 1220000405251 is 1525040000221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220000405251 - 2³ = 1220000405243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220000405551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610000202625 + 610000202626.

It is an arithmetic number, because the mean of its divisors is an integer number (610000202626).

Almost surely, 2^{1220000405251} is an apocalyptic number.

1220000405251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220000405251 is an equidigital number, since it uses as much as digits as its factorization.

1220000405251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 1220000405251 its reverse (1525040000221), we get a palindrome (2745040405472).

The spelling of 1220000405251 in words is "one trillion, two hundred twenty billion, four hundred five thousand, two hundred fifty-one".