1247421213 has 6 divisors (see below), whose sum is σ = 1801830654. Its totient is φ = 831614136.

The previous prime is 1247421211. The next prime is 1247421221. The reversal of 1247421213 is 3121247421.

1247421213 is a `hidden beast` number, since 1 + 24 + 7 + 421 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1225910169 + 21511044 = 35013^2 + 4638^2 .

It is not a de Polignac number, because 1247421213 - 2¹ = 1247421211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247421211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69301170 + ... + 69301187.

It is an arithmetic number, because the mean of its divisors is an integer number (300305109).

Almost surely, 2^1247421213 is an apocalyptic number.

It is an amenable number.

1247421213 is a deficient number, since it is larger than the sum of its proper divisors (554409441).

1247421213 is a wasteful number, since it uses less digits than its factorization.

1247421213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138602363 (or 138602360 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1247421213 is about 35318.8506749583. The cubic root of 1247421213 is about 1076.4760579268.

Adding to 1247421213 its reverse (3121247421), we get a palindrome (4368668634).

The spelling of 1247421213 in words is "one billion, two hundred forty-seven million, four hundred twenty-one thousand, two hundred thirteen".