1213521219 has 24 divisors (see below), whose sum is σ = 1782020240. Its totient is φ = 795598848.

The previous prime is 1213521173. The next prime is 1213521233. The reversal of 1213521219 is 9121253121.

1213521219 is a `hidden beast` number, since 121 + 3 + 521 + 2 + 19 = 666.

It is not a de Polignac number, because 1213521219 - 2⁷ = 1213521091 is a prime.

It is a super-2 number, since 2×1213521219² = 2945267497926491922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213521192 and 1213521201.

It is not an unprimeable number, because it can be changed into a prime (1213521259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 462399 + ... + 465015.

Almost surely, 2^1213521219 is an apocalyptic number.

1213521219 is a deficient number, since it is larger than the sum of its proper divisors (568499021).

1213521219 is a wasteful number, since it uses less digits than its factorization.

1213521219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459 (or 3456 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 1213521219 is about 34835.6314568862. The cubic root of 1213521219 is about 1066.6349047943.

The spelling of 1213521219 in words is "one billion, two hundred thirteen million, five hundred twenty-one thousand, two hundred nineteen".