21221546646043 has 8 divisors (see below), whose sum is σ = 21274206451776. Its totient is φ = 21168902683200.

The previous prime is 21221546646029. The next prime is 21221546646067. The reversal of 21221546646043 is 34064664512212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221546646043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221546645984 and 21221546646002.

It is not an unprimeable number, because it can be changed into a prime (21221546646143) 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, 1276146 + ... + 6638647.

It is an arithmetic number, because the mean of its divisors is an integer number (2659275806472).

Almost surely, 2^{21221546646043} is an apocalyptic number.

21221546646043 is a deficient number, since it is larger than the sum of its proper divisors (52659805733).

21221546646043 is an equidigital number, since it uses as much as digits as its factorization.

21221546646043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921445.

The product of its (nonzero) digits is 1658880, while the sum is 46.

The spelling of 21221546646043 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred forty-six million, six hundred forty-six thousand, forty-three".