1225222225621 has 2 divisors, whose sum is σ = 1225222225622. Its totient is φ = 1225222225620.

The previous prime is 1225222225609. The next prime is 1225222225639. The reversal of 1225222225621 is 1265222225221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1224364380100 + 857845521 = 1106510^2 + 29289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225222225621 - 2⁵ = 1225222225589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225222225691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612611112810 + 612611112811.

It is an arithmetic number, because the mean of its divisors is an integer number (612611112811).

Almost surely, 2^{1225222225621} is an apocalyptic number.

It is an amenable number.

1225222225621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225222225621 is an equidigital number, since it uses as much as digits as its factorization.

1225222225621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 34.

The spelling of 1225222225621 in words is "one trillion, two hundred twenty-five billion, two hundred twenty-two million, two hundred twenty-five thousand, six hundred twenty-one".