1781834137021 has 32 divisors (see below), whose sum is σ = 1890903571200. Its totient is φ = 1676546242560.

The previous prime is 1781834137003. The next prime is 1781834137099. The reversal of 1781834137021 is 1207314381871.

It is not a de Polignac number, because 1781834137021 - 2⁵ = 1781834136989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781834134021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170358490 + ... + 170368948.

It is an arithmetic number, because the mean of its divisors is an integer number (59090736600).

Almost surely, 2^{1781834137021} is an apocalyptic number.

It is an amenable number.

1781834137021 is a deficient number, since it is larger than the sum of its proper divisors (109069434179).

1781834137021 is a wasteful number, since it uses less digits than its factorization.

1781834137021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11509.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 1781834137021 in words is "one trillion, seven hundred eighty-one billion, eight hundred thirty-four million, one hundred thirty-seven thousand, twenty-one".