1213421624 has 16 divisors (see below), whose sum is σ = 2394911400. Its totient is φ = 574778592.

The previous prime is 1213421617. The next prime is 1213421633. The reversal of 1213421624 is 4261243121.

It is a junction number, because it is equal to n+sod(n) for n = 1213421593 and 1213421602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3991367 + ... + 3991670.

Almost surely, 2^1213421624 is an apocalyptic number.

It is an amenable number.

1213421624 is a deficient number, since it is larger than the sum of its proper divisors (1181489776).

1213421624 is a wasteful number, since it uses less digits than its factorization.

1213421624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7983062 (or 7983058 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 1213421624 is about 34834.2019285644. The cubic root of 1213421624 is about 1066.6057240355.

Adding to 1213421624 its reverse (4261243121), we get a palindrome (5474664745).

The spelling of 1213421624 in words is "one billion, two hundred thirteen million, four hundred twenty-one thousand, six hundred twenty-four".