21622046505421 has 8 divisors (see below), whose sum is σ = 21747665549880. Its totient is φ = 21496434772992.

The previous prime is 21622046505403. The next prime is 21622046505461. The reversal of 21622046505421 is 12450564022612.

It can be written as a sum of positive squares in 4 ways, for example, as 12919812003396 + 8702234502025 = 3594414^2 + 2949955^2 .

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 21622046505421 - 2¹³ = 21622046497229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622046505461) 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, 4160085 + ... + 7781413.

It is an arithmetic number, because the mean of its divisors is an integer number (2718458193735).

Almost surely, 2^{21622046505421} is an apocalyptic number.

It is an amenable number.

21622046505421 is a deficient number, since it is larger than the sum of its proper divisors (125619044459).

21622046505421 is a wasteful number, since it uses less digits than its factorization.

21622046505421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656015.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 21622046505421 in words is "twenty-one trillion, six hundred twenty-two billion, forty-six million, five hundred five thousand, four hundred twenty-one".