21221546646041 has 8 divisors (see below), whose sum is σ = 24253224991680. Its totient is φ = 18189875506608.

The previous prime is 21221546646029. The next prime is 21221546646067. The reversal of 21221546646041 is 14064664512212.

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 21221546646041 - 2¹⁸ = 21221546383897 is a prime.

It is a super-2 number, since 2×21221546646041² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221546645983 and 21221546646001.

It is not an unprimeable number, because it can be changed into a prime (21221546646941) 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, 8241155 + ... + 10505223.

It is an arithmetic number, because the mean of its divisors is an integer number (3031653123960).

Almost surely, 2^{21221546646041} is an apocalyptic number.

It is an amenable number.

21221546646041 is a deficient number, since it is larger than the sum of its proper divisors (3031678345639).

21221546646041 is a wasteful number, since it uses less digits than its factorization.

21221546646041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603103.

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 21221546646041 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred forty-six million, six hundred forty-six thousand, forty-one".