1221212002104 has 40 divisors (see below), whose sum is σ = 3420524359560. Its totient is φ = 407070667152.

The previous prime is 1221212002103. The next prime is 1221212002133. The reversal of 1221212002104 is 4012002121221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212002103) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 942292564 + ... + 942293859.

It is an arithmetic number, because the mean of its divisors is an integer number (85513108989).

Almost surely, 2^{1221212002104} is an apocalyptic number.

It is an amenable number.

1221212002104 is an abundant number, since it is smaller than the sum of its proper divisors (2199312357456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221212002104 is a wasteful number, since it uses less digits than its factorization.

1221212002104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884586441 (or 1884586428 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221212002104 its reverse (4012002121221), we get a palindrome (5233214123325).

The spelling of 1221212002104 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two thousand, one hundred four".