1221452047 has 2 divisors, whose sum is σ = 1221452048. Its totient is φ = 1221452046.

The previous prime is 1221452041. The next prime is 1221452059. The reversal of 1221452047 is 7402541221.

It is a weak prime.

It is an emirp because it is prime and its reverse (7402541221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221452047 - 2³ = 1221452039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221452041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610726023 + 610726024.

It is an arithmetic number, because the mean of its divisors is an integer number (610726024).

Almost surely, 2^1221452047 is an apocalyptic number.

1221452047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221452047 is an equidigital number, since it uses as much as digits as its factorization.

1221452047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 1221452047 is about 34949.2782042777. The cubic root of 1221452047 is about 1068.9534843130.

Adding to 1221452047 its reverse (7402541221), we get a palindrome (8623993268).

It can be divided in two parts, 12214 and 52047, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 1221452047 in words is "one billion, two hundred twenty-one million, four hundred fifty-two thousand, forty-seven".