21126251154655 has 8 divisors (see below), whose sum is σ = 25351643745792. Its totient is φ = 16900906016928.

The previous prime is 21126251154637. The next prime is 21126251154691. The reversal of 21126251154655 is 55645115262112.

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 21126251154655 - 2⁵ = 21126251154623 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, 10876447 + ... + 12670816.

It is an arithmetic number, because the mean of its divisors is an integer number (3168955468224).

Almost surely, 2^{21126251154655} is an apocalyptic number.

21126251154655 is a deficient number, since it is larger than the sum of its proper divisors (4225392591137).

21126251154655 is a wasteful number, since it uses less digits than its factorization.

21126251154655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23726705.

The product of its digits is 720000, while the sum is 46.

The spelling of 21126251154655 in words is "twenty-one trillion, one hundred twenty-six billion, two hundred fifty-one million, one hundred fifty-four thousand, six hundred fifty-five".