1221510652 has 6 divisors (see below), whose sum is σ = 2137643648. Its totient is φ = 610755324.

The previous prime is 1221510643. The next prime is 1221510691. The reversal of 1221510652 is 2560151221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152688828 + ... + 152688835.

Almost surely, 2^1221510652 is an apocalyptic number.

It is an amenable number.

1221510652 is a deficient number, since it is larger than the sum of its proper divisors (916132996).

1221510652 is a wasteful number, since it uses less digits than its factorization.

1221510652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305377667 (or 305377665 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1221510652 is about 34950.1166235536. The cubic root of 1221510652 is about 1068.9705800905.

Adding to 1221510652 its reverse (2560151221), we get a palindrome (3781661873).

The spelling of 1221510652 in words is "one billion, two hundred twenty-one million, five hundred ten thousand, six hundred fifty-two".