1221004004025 has 48 divisors (see below), whose sum is σ = 2177560863296. Its totient is φ = 600128766720.

The previous prime is 1221004004009. The next prime is 1221004004083. The reversal of 1221004004025 is 5204004001221.

It is not a de Polignac number, because 1221004004025 - 2⁴ = 1221004004009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221004003992 and 1221004004010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 423787 + ... + 1619136.

Almost surely, 2^{1221004004025} is an apocalyptic number.

1221004004025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221004004025 is a deficient number, since it is larger than the sum of its proper divisors (956556859271).

1221004004025 is a wasteful number, since it uses less digits than its factorization.

1221004004025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043562 (or 2043557 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 1221004004025 its reverse (5204004001221), we get a palindrome (6425008005246).

The spelling of 1221004004025 in words is "one trillion, two hundred twenty-one billion, four million, four thousand, twenty-five".