1620221343 has 16 divisors (see below), whose sum is σ = 2327245536. Its totient is φ = 996727680.

The previous prime is 1620221311. The next prime is 1620221359. The reversal of 1620221343 is 3431220261.

It is not a de Polignac number, because 1620221343 - 2⁵ = 1620221311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620221303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167721 + ... + 177117.

It is an arithmetic number, because the mean of its divisors is an integer number (145452846).

Almost surely, 2^1620221343 is an apocalyptic number.

1620221343 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1620221343 is a deficient number, since it is larger than the sum of its proper divisors (707024193).

1620221343 is a wasteful number, since it uses less digits than its factorization.

1620221343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13834.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1620221343 is about 40251.9731566044. The cubic root of 1620221343 is about 1174.5137793313.

The spelling of 1620221343 in words is "one billion, six hundred twenty million, two hundred twenty-one thousand, three hundred forty-three".