1321924591898 has 4 divisors (see below), whose sum is σ = 1982886887850. Its totient is φ = 660962295948.

The previous prime is 1321924591891. The next prime is 1321924591913. The reversal of 1321924591898 is 8981954291231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1268153011129 + 53771580769 = 1126123^2 + 231887^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1321924591898.

It is not an unprimeable number, because it can be changed into a prime (1321924591891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330481147973 + ... + 330481147976.

Almost surely, 2^{1321924591898} is an apocalyptic number.

1321924591898 is a deficient number, since it is larger than the sum of its proper divisors (660962295952).

1321924591898 is an equidigital number, since it uses as much as digits as its factorization.

1321924591898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660962295951.

The product of its digits is 11197440, while the sum is 62.

The spelling of 1321924591898 in words is "one trillion, three hundred twenty-one billion, nine hundred twenty-four million, five hundred ninety-one thousand, eight hundred ninety-eight".