1228155521229 has 64 divisors (see below), whose sum is σ = 2251097210880. Its totient is φ = 644426331840.

The previous prime is 1228155521213. The next prime is 1228155521237. The reversal of 1228155521229 is 9221255518221.

1228155521229 is a `hidden beast` number, since 1 + 2 + 2 + 81 + 5 + 552 + 12 + 2 + 9 = 666.

It is not a de Polignac number, because 1228155521229 - 2⁴ = 1228155521213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228155521249) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 839247 + ... + 1777820.

It is an arithmetic number, because the mean of its divisors is an integer number (35173393920).

Almost surely, 2^{1228155521229} is an apocalyptic number.

It is an amenable number.

1228155521229 is a deficient number, since it is larger than the sum of its proper divisors (1022941689651).

1228155521229 is a wasteful number, since it uses less digits than its factorization.

1228155521229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617287 (or 2617281 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The spelling of 1228155521229 in words is "one trillion, two hundred twenty-eight billion, one hundred fifty-five million, five hundred twenty-one thousand, two hundred twenty-nine".