1213620213 has 16 divisors (see below), whose sum is σ = 1785139776. Its totient is φ = 728626560.

The previous prime is 1213620211. The next prime is 1213620223. The reversal of 1213620213 is 3120263121.

It is not a de Polignac number, because 1213620213 - 2¹ = 1213620211 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213620213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213620211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377895 + ... + 381092.

It is an arithmetic number, because the mean of its divisors is an integer number (111571236).

Almost surely, 2^1213620213 is an apocalyptic number.

1213620213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1213620213 is a deficient number, since it is larger than the sum of its proper divisors (571519563).

1213620213 is a wasteful number, since it uses less digits than its factorization.

1213620213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759044.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1213620213 is about 34837.0523006755. The cubic root of 1213620213 is about 1066.6639078813.

Adding to 1213620213 its reverse (3120263121), we get a palindrome (4333883334).

The spelling of 1213620213 in words is "one billion, two hundred thirteen million, six hundred twenty thousand, two hundred thirteen".