20844295021761 has 4 divisors (see below), whose sum is σ = 27792393362352. Its totient is φ = 13896196681172.

The previous prime is 20844295021729. The next prime is 20844295021787. The reversal of 20844295021761 is 16712059244802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20844295021761 - 2⁵ = 20844295021729 is a prime.

It is a super-2 number, since 2×20844295021761² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20844295021261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3474049170291 + ... + 3474049170296.

It is an arithmetic number, because the mean of its divisors is an integer number (6948098340588).

Almost surely, 2^{20844295021761} is an apocalyptic number.

It is an amenable number.

20844295021761 is a deficient number, since it is larger than the sum of its proper divisors (6948098340591).

20844295021761 is an equidigital number, since it uses as much as digits as its factorization.

20844295021761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948098340590.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 20844295021761 in words is "twenty trillion, eight hundred forty-four billion, two hundred ninety-five million, twenty-one thousand, seven hundred sixty-one".