1621426323 has 32 divisors (see below), whose sum is σ = 2500111872. Its totient is φ = 923788800.

The previous prime is 1621426277. The next prime is 1621426343. The reversal of 1621426323 is 3236241261.

It is not a de Polignac number, because 1621426323 - 2¹³ = 1621418131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1621426343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 908490 + ... + 910272.

It is an arithmetic number, because the mean of its divisors is an integer number (78128496).

Almost surely, 2^1621426323 is an apocalyptic number.

1621426323 is a deficient number, since it is larger than the sum of its proper divisors (878685549).

1621426323 is a wasteful number, since it uses less digits than its factorization.

1621426323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3435.

The product of its digits is 10368, while the sum is 30.

The square root of 1621426323 is about 40266.9383365560. The cubic root of 1621426323 is about 1174.8048743133.

Adding to 1621426323 its reverse (3236241261), we get a palindrome (4857667584).

The spelling of 1621426323 in words is "one billion, six hundred twenty-one million, four hundred twenty-six thousand, three hundred twenty-three".