1221212002004 has 12 divisors (see below), whose sum is σ = 2137306132500. Its totient is φ = 610553107008.

The previous prime is 1221212001991. The next prime is 1221212002027. The reversal of 1221212002004 is 4002002121221.

It can be written as a sum of positive squares in 2 ways, for example, as 1046569920400 + 174642081604 = 1023020^2 + 417902^2 .

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, 13171529 + ... + 13263920.

It is an arithmetic number, because the mean of its divisors is an integer number (178108844375).

Almost surely, 2^{1221212002004} is an apocalyptic number.

It is an amenable number.

1221212002004 is a deficient number, since it is larger than the sum of its proper divisors (916094130496).

1221212002004 is a wasteful number, since it uses less digits than its factorization.

1221212002004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26447002 (or 26447000 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221212002004 its reverse (4002002121221), we get a palindrome (5223214123225).

The spelling of 1221212002004 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two thousand, four".