1356429421 has 2 divisors, whose sum is σ = 1356429422. Its totient is φ = 1356429420.

The previous prime is 1356429407. The next prime is 1356429491. The reversal of 1356429421 is 1249246531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197921321 + 158508100 = 34611^2 + 12590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1356429421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1356429401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678214710 + 678214711.

It is an arithmetic number, because the mean of its divisors is an integer number (678214711).

Almost surely, 2^1356429421 is an apocalyptic number.

It is an amenable number.

1356429421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356429421 is an equidigital number, since it uses as much as digits as its factorization.

1356429421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 1356429421 is about 36829.7355543045. The cubic root of 1356429421 is about 1106.9612041523.

The spelling of 1356429421 in words is "one billion, three hundred fifty-six million, four hundred twenty-nine thousand, four hundred twenty-one".