2061721380813 has 8 divisors (see below), whose sum is σ = 2750736516000. Its totient is φ = 1373593583088.

The previous prime is 2061721380809. The next prime is 2061721380833. The reversal of 2061721380813 is 3180831271602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2061721380813 - 2² = 2061721380809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061721380833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221828943 + ... + 221838236.

It is an arithmetic number, because the mean of its divisors is an integer number (343842064500).

Almost surely, 2^{2061721380813} is an apocalyptic number.

It is an amenable number.

2061721380813 is a deficient number, since it is larger than the sum of its proper divisors (689015135187).

2061721380813 is a wasteful number, since it uses less digits than its factorization.

2061721380813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443668731.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 2061721380813 in words is "two trillion, sixty-one billion, seven hundred twenty-one million, three hundred eighty thousand, eight hundred thirteen".