21146553265641 has 8 divisors (see below), whose sum is σ = 28195439426304. Its totient is φ = 14097684641040.

The previous prime is 21146553265633. The next prime is 21146553265723. The reversal of 21146553265641 is 14656235564112.

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

It is not a de Polignac number, because 21146553265641 - 2³ = 21146553265633 is a prime.

It is a super-2 number, since 2×21146553265641² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21146553265241) 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, 1250265 + ... + 6622406.

It is an arithmetic number, because the mean of its divisors is an integer number (3524429928288).

Almost surely, 2^{21146553265641} is an apocalyptic number.

It is an amenable number.

21146553265641 is a deficient number, since it is larger than the sum of its proper divisors (7048886160663).

21146553265641 is an equidigital number, since it uses as much as digits as its factorization.

21146553265641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8768031.

The product of its digits is 5184000, while the sum is 51.

The spelling of 21146553265641 in words is "twenty-one trillion, one hundred forty-six billion, five hundred fifty-three million, two hundred sixty-five thousand, six hundred forty-one".