1221052507 has 2 divisors, whose sum is σ = 1221052508. Its totient is φ = 1221052506.

The previous prime is 1221052493. The next prime is 1221052513. The reversal of 1221052507 is 7052501221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221052507 - 2²⁷ = 1086834779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221052597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610526253 + 610526254.

It is an arithmetic number, because the mean of its divisors is an integer number (610526254).

Almost surely, 2^1221052507 is an apocalyptic number.

1221052507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221052507 is an equidigital number, since it uses as much as digits as its factorization.

1221052507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 1221052507 is about 34943.5617388955. The cubic root of 1221052507 is about 1068.8369191555.

Adding to 1221052507 its reverse (7052501221), we get a palindrome (8273553728).

The spelling of 1221052507 in words is "one billion, two hundred twenty-one million, fifty-two thousand, five hundred seven".