21151251105023 has 8 divisors (see below), whose sum is σ = 22778306158608. Its totient is φ = 19524201156864.

The previous prime is 21151251104993. The next prime is 21151251105031. The reversal of 21151251105023 is 32050115215112.

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 21151251105023 - 2¹⁰ = 21151251103999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151251105053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15343136 + ... + 16664762.

It is an arithmetic number, because the mean of its divisors is an integer number (2847288269826).

Almost surely, 2^{21151251105023} is an apocalyptic number.

21151251105023 is a deficient number, since it is larger than the sum of its proper divisors (1627055053585).

21151251105023 is a wasteful number, since it uses less digits than its factorization.

21151251105023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552713.

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 21151251105023 in words is "twenty-one trillion, one hundred fifty-one billion, two hundred fifty-one million, one hundred five thousand, twenty-three".