21629233655 has 8 divisors (see below), whose sum is σ = 26114314992. Its totient is φ = 17197230528.

The previous prime is 21629233643. The next prime is 21629233663. The reversal of 21629233655 is 55633292612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21629233655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13268654 + ... + 13270283.

It is an arithmetic number, because the mean of its divisors is an integer number (3264289374).

Almost surely, 2^21629233655 is an apocalyptic number.

21629233655 is a deficient number, since it is larger than the sum of its proper divisors (4485081337).

21629233655 is a wasteful number, since it uses less digits than its factorization.

21629233655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26539105.

The product of its digits is 583200, while the sum is 44.

The spelling of 21629233655 in words is "twenty-one billion, six hundred twenty-nine million, two hundred thirty-three thousand, six hundred fifty-five".