1215121006 has 16 divisors (see below), whose sum is σ = 1992215088. Its totient is φ = 551262400.

The previous prime is 1215120971. The next prime is 1215121013. The reversal of 1215121006 is 6001215121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41545 + ... + 64468.

It is an arithmetic number, because the mean of its divisors is an integer number (124513443).

Almost surely, 2^1215121006 is an apocalyptic number.

1215121006 is a deficient number, since it is larger than the sum of its proper divisors (777094082).

1215121006 is a wasteful number, since it uses less digits than its factorization.

1215121006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106547.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1215121006 is about 34858.5858290321. The cubic root of 1215121006 is about 1067.1034144864.

Adding to 1215121006 its reverse (6001215121), we get a palindrome (7216336127).

It can be divided in two parts, 1215 and 121006, that added together give a palindrome (122221).

The spelling of 1215121006 in words is "one billion, two hundred fifteen million, one hundred twenty-one thousand, six".