1721987345364 has 48 divisors (see below), whose sum is σ = 4720412867520. Its totient is φ = 481674781440.

The previous prime is 1721987345341. The next prime is 1721987345371. The reversal of 1721987345364 is 4635437891271.

It is a junction number, because it is equal to n+sod(n) for n = 1721987345298 and 1721987345307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501742849 + ... + 501746280.

It is an arithmetic number, because the mean of its divisors is an integer number (98341934740).

Almost surely, 2^{1721987345364} is an apocalyptic number.

It is an amenable number.

1721987345364 is an abundant number, since it is smaller than the sum of its proper divisors (2998425522156).

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

1721987345364 is a wasteful number, since it uses less digits than its factorization.

1721987345364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003489160 (or 1003489158 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 60.

The spelling of 1721987345364 in words is "one trillion, seven hundred twenty-one billion, nine hundred eighty-seven million, three hundred forty-five thousand, three hundred sixty-four".