21604651622 has 8 divisors (see below), whose sum is σ = 32613391776. Its totient is φ = 10733521032.

The previous prime is 21604651589. The next prime is 21604651667. The reversal of 21604651622 is 22615640612.

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, 34401998 + ... + 34402625.

It is an arithmetic number, because the mean of its divisors is an integer number (4076673972).

Almost surely, 2^21604651622 is an apocalyptic number.

21604651622 is a deficient number, since it is larger than the sum of its proper divisors (11008740154).

21604651622 is a wasteful number, since it uses less digits than its factorization.

21604651622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68804782.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 21604651622 in words is "twenty-one billion, six hundred four million, six hundred fifty-one thousand, six hundred twenty-two".