21364162373561 has 8 divisors (see below), whose sum is σ = 24511190184960. Its totient is φ = 18240885715968.

The previous prime is 21364162373557. The next prime is 21364162373591. The reversal of 21364162373561 is 16537326146312.

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 21364162373561 - 2² = 21364162373557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21364162373591) 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, 5937786521 + ... + 5937790118.

It is an arithmetic number, because the mean of its divisors is an integer number (3063898773120).

Almost surely, 2^{21364162373561} is an apocalyptic number.

It is an amenable number.

21364162373561 is a deficient number, since it is larger than the sum of its proper divisors (3147027811399).

21364162373561 is a wasteful number, since it uses less digits than its factorization.

21364162373561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11875576903.

The product of its digits is 3265920, while the sum is 50.

The spelling of 21364162373561 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred sixty-two million, three hundred seventy-three thousand, five hundred sixty-one".