21154510263263 has 8 divisors (see below), whose sum is σ = 23567358914400. Its totient is φ = 18853887130848.

The previous prime is 21154510263253. The next prime is 21154510263277. The reversal of 21154510263263 is 36236201545112.

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 21154510263263 - 2¹⁰ = 21154510262239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21154510263263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154510263253) 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, 28056379283 + ... + 28056380036.

It is an arithmetic number, because the mean of its divisors is an integer number (2945919864300).

Almost surely, 2^{21154510263263} is an apocalyptic number.

21154510263263 is a deficient number, since it is larger than the sum of its proper divisors (2412848651137).

21154510263263 is a wasteful number, since it uses less digits than its factorization.

21154510263263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56112759361.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 21154510263263 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred ten million, two hundred sixty-three thousand, two hundred sixty-three".