21364161747751 has 8 divisors (see below), whose sum is σ = 21991663877904. Its totient is φ = 20744970904320.

The previous prime is 21364161747743. The next prime is 21364161747769. The reversal of 21364161747751 is 15774716146312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21364161747751 - 2³ = 21364161747743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21364161747692 and 21364161747701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364161747701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2077816465 + ... + 2077826746.

It is an arithmetic number, because the mean of its divisors is an integer number (2748957984738).

Almost surely, 2^{21364161747751} is an apocalyptic number.

21364161747751 is a deficient number, since it is larger than the sum of its proper divisors (627502130153).

21364161747751 is an equidigital number, since it uses as much as digits as its factorization.

21364161747751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155643361.

The product of its digits is 5927040, while the sum is 55.

The spelling of 21364161747751 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred sixty-one million, seven hundred forty-seven thousand, seven hundred fifty-one".