1356355421 has 4 divisors (see below), whose sum is σ = 1436141052. Its totient is φ = 1276569792.

The previous prime is 1356355409. The next prime is 1356355423. The reversal of 1356355421 is 1245536531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1245536531 = 7933 ⋅157007.

It can be written as a sum of positive squares in 2 ways, for example, as 659976100 + 696379321 = 25690^2 + 26389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356355421 - 2²² = 1352161117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356355423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39892790 + ... + 39892823.

It is an arithmetic number, because the mean of its divisors is an integer number (359035263).

Almost surely, 2^1356355421 is an apocalyptic number.

It is an amenable number.

1356355421 is a deficient number, since it is larger than the sum of its proper divisors (79785631).

1356355421 is an equidigital number, since it uses as much as digits as its factorization.

1356355421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79785630.

The product of its digits is 54000, while the sum is 35.

The square root of 1356355421 is about 36828.7309175866. The cubic root of 1356355421 is about 1106.9410736986.

The spelling of 1356355421 in words is "one billion, three hundred fifty-six million, three hundred fifty-five thousand, four hundred twenty-one".