1221610122 has 12 divisors (see below), whose sum is σ = 2646821970. Its totient is φ = 407203368.

The previous prime is 1221610121. The next prime is 1221610147. The reversal of 1221610122 is 2210161221.

1221610122 is a `hidden beast` number, since 12 + 21 + 610 + 1 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 982258281 + 239351841 = 31341^2 + 15471^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67867229 = 1221610122 / (1 + 2 + 2 + 1 + 6 + 1 + 0 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 1221610095 and 1221610104.

It is not an unprimeable number, because it can be changed into a prime (1221610121) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 33933597 + ... + 33933632.

Almost surely, 2^1221610122 is an apocalyptic number.

1221610122 is an abundant number, since it is smaller than the sum of its proper divisors (1425211848).

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

1221610122 is a wasteful number, since it uses less digits than its factorization.

1221610122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67867237 (or 67867234 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1221610122 is about 34951.5396227405. The cubic root of 1221610122 is about 1068.9995954241. Note that the first 3 decimals are identical.

Adding to 1221610122 its reverse (2210161221), we get a palindrome (3431771343).

The spelling of 1221610122 in words is "one billion, two hundred twenty-one million, six hundred ten thousand, one hundred twenty-two".