1381322421 has 18 divisors (see below), whose sum is σ = 2003043042. Its totient is φ = 917291520.

The previous prime is 1381322419. The next prime is 1381322429. The reversal of 1381322421 is 1242231831.

It can be written as a sum of positive squares in 3 ways, for example, as 981882225 + 399440196 = 31335^2 + 19986^2 .

It is not a de Polignac number, because 1381322421 - 2¹ = 1381322419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381322429) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2393685 + ... + 2394261.

It is an arithmetic number, because the mean of its divisors is an integer number (111280169).

Almost surely, 2^1381322421 is an apocalyptic number.

It is an amenable number.

1381322421 is a deficient number, since it is larger than the sum of its proper divisors (621720621).

1381322421 is an frugal number, since it uses more digits than its factorization.

1381322421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621 (or 1041 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 1381322421 is about 37166.1461682537. The cubic root of 1381322421 is about 1113.6917958299.

The spelling of 1381322421 in words is "one billion, three hundred eighty-one million, three hundred twenty-two thousand, four hundred twenty-one".