2101782609409 has 24 divisors (see below), whose sum is σ = 2551355152128. Its totient is φ = 1723117556160.

The previous prime is 2101782609379. The next prime is 2101782609461. The reversal of 2101782609409 is 9049062871012.

It is not a de Polignac number, because 2101782609409 - 2⁹ = 2101782608897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101782609469) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36532264 + ... + 36589750.

It is an arithmetic number, because the mean of its divisors is an integer number (106306464672).

Almost surely, 2^{2101782609409} is an apocalyptic number.

It is an amenable number.

2101782609409 is a deficient number, since it is larger than the sum of its proper divisors (449572542719).

2101782609409 is a wasteful number, since it uses less digits than its factorization.

2101782609409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89965 (or 89958 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 2101782609409 in words is "two trillion, one hundred one billion, seven hundred eighty-two million, six hundred nine thousand, four hundred nine".