1220121247 has 2 divisors, whose sum is σ = 1220121248. Its totient is φ = 1220121246.

The previous prime is 1220121169. The next prime is 1220121251. The reversal of 1220121247 is 7421210221.

It is a strong prime.

It is an emirp because it is prime and its reverse (7421210221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220121247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220121547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060623 + 610060624.

It is an arithmetic number, because the mean of its divisors is an integer number (610060624).

Almost surely, 2^1220121247 is an apocalyptic number.

1220121247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121247 is an equidigital number, since it uses as much as digits as its factorization.

1220121247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 1220121247 is about 34930.2339957808. The cubic root of 1220121247 is about 1068.5651267971.

Adding to 1220121247 its reverse (7421210221), we get a palindrome (8641331468).

The spelling of 1220121247 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred forty-seven".