1213221562 has 16 divisors (see below), whose sum is σ = 2098216512. Its totient is φ = 515350080.

The previous prime is 1213221547. The next prime is 1213221563. The reversal of 1213221562 is 2651223121.

It is not an unprimeable number, because it can be changed into a prime (1213221563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381864 + ... + 385027.

It is an arithmetic number, because the mean of its divisors is an integer number (131138532).

Almost surely, 2^1213221562 is an apocalyptic number.

1213221562 is a deficient number, since it is larger than the sum of its proper divisors (884994950).

1213221562 is a wasteful number, since it uses less digits than its factorization.

1213221562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767013.

The product of its digits is 1440, while the sum is 25.

The square root of 1213221562 is about 34831.3301784471. The cubic root of 1213221562 is about 1066.5471022016.

Adding to 1213221562 its reverse (2651223121), we get a palindrome (3864444683).

The spelling of 1213221562 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, five hundred sixty-two".