21466124652561 has 8 divisors (see below), whose sum is σ = 28811045891904. Its totient is φ = 14215976590800.

The previous prime is 21466124652547. The next prime is 21466124652601. The reversal of 21466124652561 is 16525642166412.

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

It is not a de Polignac number, because 21466124652561 - 2²⁵ = 21466091098129 is a prime.

It is a super-2 number, since 2×21466124652561² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21466124650561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23693293866 + ... + 23693294771.

It is an arithmetic number, because the mean of its divisors is an integer number (3601380736488).

Almost surely, 2^{21466124652561} is an apocalyptic number.

It is an amenable number.

21466124652561 is a deficient number, since it is larger than the sum of its proper divisors (7344921239343).

21466124652561 is a wasteful number, since it uses less digits than its factorization.

21466124652561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47386588791.

The product of its digits is 4147200, while the sum is 51.

The spelling of 21466124652561 in words is "twenty-one trillion, four hundred sixty-six billion, one hundred twenty-four million, six hundred fifty-two thousand, five hundred sixty-one".