21647622633 has 24 divisors (see below), whose sum is σ = 36158669568. Its totient is φ = 11418525216.

The previous prime is 21647622631. The next prime is 21647622641. The reversal of 21647622633 is 33622674612.

It is not a de Polignac number, because 21647622633 - 2¹ = 21647622631 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21647622631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5662041 + ... + 5665862.

It is an arithmetic number, because the mean of its divisors is an integer number (1506611232).

Almost surely, 2^21647622633 is an apocalyptic number.

It is an amenable number.

21647622633 is a deficient number, since it is larger than the sum of its proper divisors (14511046935).

21647622633 is a wasteful number, since it uses less digits than its factorization.

21647622633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11327933 (or 11327926 counting only the distinct ones).

The product of its digits is 435456, while the sum is 42.

The spelling of 21647622633 in words is "twenty-one billion, six hundred forty-seven million, six hundred twenty-two thousand, six hundred thirty-three".