21049222655 has 8 divisors (see below), whose sum is σ = 25504301472. Its totient is φ = 16675888608.

The previous prime is 21049222619. The next prime is 21049222679. The reversal of 21049222655 is 55622294012.

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 21049222655 - 2⁸ = 21049222399 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, 20435624 + ... + 20436653.

It is an arithmetic number, because the mean of its divisors is an integer number (3188037684).

Almost surely, 2^21049222655 is an apocalyptic number.

21049222655 is a deficient number, since it is larger than the sum of its proper divisors (4455078817).

21049222655 is a wasteful number, since it uses less digits than its factorization.

21049222655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40872385.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 21049222655 in words is "twenty-one billion, forty-nine million, two hundred twenty-two thousand, six hundred fifty-five".