1621071834198 has 16 divisors (see below), whose sum is σ = 3242271421440. Its totient is φ = 540335985896.

The previous prime is 1621071834149. The next prime is 1621071834229. The reversal of 1621071834198 is 8914381701261.

It is a self number, because there is not a number n which added to its sum of digits gives 1621071834198.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5157690 + ... + 5462957.

It is an arithmetic number, because the mean of its divisors is an integer number (202641963840).

Almost surely, 2^{1621071834198} is an apocalyptic number.

1621071834198 is an abundant number, since it is smaller than the sum of its proper divisors (1621199587242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621071834198 is a wasteful number, since it uses less digits than its factorization.

1621071834198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646091.

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 1621071834198 in words is "one trillion, six hundred twenty-one billion, seventy-one million, eight hundred thirty-four thousand, one hundred ninety-eight".