21466577021 has 8 divisors (see below), whose sum is σ = 21523129344. Its totient is φ = 21410092800.

The previous prime is 21466576981. The next prime is 21466577029. The reversal of 21466577021 is 12077566412.

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 21466577021 - 2³⁴ = 4286707837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21466577021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466577029) 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, 647966 + ... + 680288.

It is an arithmetic number, because the mean of its divisors is an integer number (2690391168).

Almost surely, 2^21466577021 is an apocalyptic number.

It is an amenable number.

21466577021 is a deficient number, since it is larger than the sum of its proper divisors (56552323).

21466577021 is a wasteful number, since it uses less digits than its factorization.

21466577021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34051.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 21466577021 in words is "twenty-one billion, four hundred sixty-six million, five hundred seventy-seven thousand, twenty-one".