1221005012 has 12 divisors (see below), whose sum is σ = 2139678996. Its totient is φ = 609668160.

The previous prime is 1221004913. The next prime is 1221005041. The reversal of 1221005012 is 2105001221.

It can be written as a sum of positive squares in 2 ways, for example, as 1073479696 + 147525316 = 32764^2 + 12146^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205289 + ... + 211152.

It is an arithmetic number, because the mean of its divisors is an integer number (178306583).

Almost surely, 2^1221005012 is an apocalyptic number.

It is an amenable number.

1221005012 is a deficient number, since it is larger than the sum of its proper divisors (918673984).

1221005012 is a wasteful number, since it uses less digits than its factorization.

1221005012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417178 (or 417176 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1221005012 is about 34942.8821364237. The cubic root of 1221005012 is about 1068.8230608741.

Adding to 1221005012 its reverse (2105001221), we get a palindrome (3326006233).

The spelling of 1221005012 in words is "one billion, two hundred twenty-one million, five thousand, twelve".