1621224359738 has 16 divisors (see below), whose sum is σ = 2459214146880. Its totient is φ = 801486708000.

The previous prime is 1621224359693. The next prime is 1621224359759. The reversal of 1621224359738 is 8379534221261.

It is a self number, because there is not a number n which added to its sum of digits gives 1621224359738.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12747563 + ... + 12874113.

It is an arithmetic number, because the mean of its divisors is an integer number (153700884180).

Almost surely, 2^{1621224359738} is an apocalyptic number.

1621224359738 is a deficient number, since it is larger than the sum of its proper divisors (837989787142).

1621224359738 is a wasteful number, since it uses less digits than its factorization.

1621224359738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198613.

The product of its digits is 4354560, while the sum is 53.

The spelling of 1621224359738 in words is "one trillion, six hundred twenty-one billion, two hundred twenty-four million, three hundred fifty-nine thousand, seven hundred thirty-eight".