1247227421 has 8 divisors (see below), whose sum is σ = 1393797888. Its totient is φ = 1106188000.

The previous prime is 1247227409. The next prime is 1247227439.

1247227421 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1247227421 - 2²² = 1243033117 is a prime.

It is a super-2 number, since 2×1247227421² = 3111152479388622482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247227021) 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, 1382285 + ... + 1383186.

It is an arithmetic number, because the mean of its divisors is an integer number (174224736).

Almost surely, 2^1247227421 is an apocalyptic number.

1247227421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1247227421 is a deficient number, since it is larger than the sum of its proper divisors (146570467).

1247227421 is a wasteful number, since it uses less digits than its factorization.

1247227421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765523.

The product of its digits is 12544, while the sum is 32.

The square root of 1247227421 is about 35316.1071042662. The cubic root of 1247227421 is about 1076.4203100501.

It can be divided in two parts, 12472 and 27421, that added together give a palindrome (39893).

The spelling of 1247227421 in words is "one billion, two hundred forty-seven million, two hundred twenty-seven thousand, four hundred twenty-one".