1621364471444 has 12 divisors (see below), whose sum is σ = 2928916464768. Its totient is φ = 784531195800.

The previous prime is 1621364471429. The next prime is 1621364471453. The reversal of 1621364471444 is 4441744631261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6537759842 + ... + 6537760089.

It is an arithmetic number, because the mean of its divisors is an integer number (244076372064).

Almost surely, 2^{1621364471444} is an apocalyptic number.

It is an amenable number.

1621364471444 is a deficient number, since it is larger than the sum of its proper divisors (1307551993324).

1621364471444 is a wasteful number, since it uses less digits than its factorization.

1621364471444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13075519966 (or 13075519964 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 47.

The spelling of 1621364471444 in words is "one trillion, six hundred twenty-one billion, three hundred sixty-four million, four hundred seventy-one thousand, four hundred forty-four".