1221123051 has 12 divisors (see below), whose sum is σ = 1764492912. Its totient is φ = 813782736.

The previous prime is 1221123047. The next prime is 1221123053. The reversal of 1221123051 is 1503211221.

It is not a de Polignac number, because 1221123051 - 2² = 1221123047 is a prime.

It is a super-2 number, since 2×1221123051² = 2982283011367097202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221123053) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2485 + ... + 49481.

It is an arithmetic number, because the mean of its divisors is an integer number (147041076).

Almost surely, 2^1221123051 is an apocalyptic number.

1221123051 is a deficient number, since it is larger than the sum of its proper divisors (543369861).

1221123051 is a wasteful number, since it uses less digits than its factorization.

1221123051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49890 (or 49887 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1221123051 is about 34944.5711234234. The cubic root of 1221123051 is about 1068.8575021031.

Adding to 1221123051 its reverse (1503211221), we get a palindrome (2724334272).

The spelling of 1221123051 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, fifty-one".