1221753122 has 16 divisors (see below), whose sum is σ = 1909674360. Its totient is φ = 585502848.

The previous prime is 1221753103. The next prime is 1221753131. The reversal of 1221753122 is 2213571221.

It can be written as a sum of positive squares in 4 ways, for example, as 1204020601 + 17732521 = 34699^2 + 4211^2 .

It is a super-2 number, since 2×1221753122² = 2985361382233493768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221753091 and 1221753100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68933 + ... + 84824.

Almost surely, 2^1221753122 is an apocalyptic number.

1221753122 is a deficient number, since it is larger than the sum of its proper divisors (687921238).

1221753122 is a wasteful number, since it uses less digits than its factorization.

1221753122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153925.

The product of its digits is 1680, while the sum is 26.

The square root of 1221753122 is about 34953.5852524458. The cubic root of 1221753122 is about 1069.0413056706.

The spelling of 1221753122 in words is "one billion, two hundred twenty-one million, seven hundred fifty-three thousand, one hundred twenty-two".