1397213421 has 4 divisors (see below), whose sum is σ = 1862951232. Its totient is φ = 931475612.

The previous prime is 1397213387. The next prime is 1397213423. The reversal of 1397213421 is 1243127931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1397213421 - 2⁹ = 1397212909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397213423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232868901 + ... + 232868906.

It is an arithmetic number, because the mean of its divisors is an integer number (465737808).

Almost surely, 2^1397213421 is an apocalyptic number.

It is an amenable number.

1397213421 is a deficient number, since it is larger than the sum of its proper divisors (465737811).

1397213421 is an equidigital number, since it uses as much as digits as its factorization.

1397213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465737810.

The product of its digits is 9072, while the sum is 33.

The square root of 1397213421 is about 37379.3180916934. The cubic root of 1397213421 is about 1117.9462312118.

The spelling of 1397213421 in words is "one billion, three hundred ninety-seven million, two hundred thirteen thousand, four hundred twenty-one".