21405216622 has 8 divisors (see below), whose sum is σ = 33214991400. Its totient is φ = 10333552824.

The previous prime is 21405216619. The next prime is 21405216643. The reversal of 21405216622 is 22661250412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184527672 + ... + 184527787.

It is an arithmetic number, because the mean of its divisors is an integer number (4151873925).

Almost surely, 2^21405216622 is an apocalyptic number.

21405216622 is a deficient number, since it is larger than the sum of its proper divisors (11809774778).

21405216622 is a wasteful number, since it uses less digits than its factorization.

21405216622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369055490.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21405216622 in words is "twenty-one billion, four hundred five million, two hundred sixteen thousand, six hundred twenty-two".