1225210116 has 72 divisors (see below), whose sum is σ = 3154334400. Its totient is φ = 369842304.

The previous prime is 1225210099. The next prime is 1225210121. The reversal of 1225210116 is 6110125221.

It is a super-2 number, since 2×1225210116² = 3002279656697466912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1225210092 and 1225210101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101785 + ... + 113183.

It is an arithmetic number, because the mean of its divisors is an integer number (43810200).

Almost surely, 2^1225210116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225210116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577167200).

1225210116 is an abundant number, since it is smaller than the sum of its proper divisors (1929124284).

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

1225210116 is a wasteful number, since it uses less digits than its factorization.

1225210116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11485 (or 11470 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1225210116 is about 35003.0015284404. The cubic root of 1225210116 is about 1070.0486529832.

Adding to 1225210116 its reverse (6110125221), we get a palindrome (7335335337).

The spelling of 1225210116 in words is "one billion, two hundred twenty-five million, two hundred ten thousand, one hundred sixteen".