21354544607650 has 12 divisors (see below), whose sum is σ = 39719452970322. Its totient is φ = 8541817843040.

The previous prime is 21354544607633. The next prime is 21354544607659. The reversal of 21354544607650 is 5670644545312.

It can be written as a sum of positive squares in 3 ways, for example, as 17848352022361 + 3506192585289 = 4224731^2 + 1872483^2 .

It is a super-2 number, since 2×21354544607650² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21354544607659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213545446027 + ... + 213545446126.

Almost surely, 2^{21354544607650} is an apocalyptic number.

21354544607650 is a deficient number, since it is larger than the sum of its proper divisors (18364908362672).

21354544607650 is a wasteful number, since it uses less digits than its factorization.

21354544607650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427090892165 (or 427090892160 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 52.

The spelling of 21354544607650 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred forty-four million, six hundred seven thousand, six hundred fifty".