1213553122 has 16 divisors (see below), whose sum is σ = 1835769600. Its totient is φ = 601641360.

The previous prime is 1213553101. The next prime is 1213553147. The reversal of 1213553122 is 2213553121.

It is a super-2 number, since 2×1213553122² = 2945422359831893768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259279 + ... + 263917.

It is an arithmetic number, because the mean of its divisors is an integer number (114735600).

Almost surely, 2^1213553122 is an apocalyptic number.

1213553122 is a deficient number, since it is larger than the sum of its proper divisors (622216478).

1213553122 is a wasteful number, since it uses less digits than its factorization.

1213553122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721.

The product of its digits is 1800, while the sum is 25.

The square root of 1213553122 is about 34836.0893614654. The cubic root of 1213553122 is about 1066.6442518510.

Subtracting 1213553122 from its reverse (2213553121), we obtain a palindrome (999999999).

The spelling of 1213553122 in words is "one billion, two hundred thirteen million, five hundred fifty-three thousand, one hundred twenty-two".