1220521012 has 12 divisors (see below), whose sum is σ = 2248328320. Its totient is φ = 578141496.

The previous prime is 1220521009. The next prime is 1220521019. The reversal of 1220521012 is 2101250221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220521019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8029668 + ... + 8029819.

Almost surely, 2^1220521012 is an apocalyptic number.

It is an amenable number.

1220521012 is a deficient number, since it is larger than the sum of its proper divisors (1027807308).

1220521012 is a wasteful number, since it uses less digits than its factorization.

1220521012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16059510 (or 16059508 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1220521012 is about 34935.9558621200. The cubic root of 1220521012 is about 1068.6818169194.

Adding to 1220521012 its reverse (2101250221), we get a palindrome (3321771233).

The spelling of 1220521012 in words is "one billion, two hundred twenty million, five hundred twenty-one thousand, twelve".