21263413640155 has 8 divisors (see below), whose sum is σ = 25687345338000. Its totient is φ = 16896564932256.

The previous prime is 21263413640141. The next prime is 21263413640159. The reversal of 21263413640155 is 55104631436212.

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 21263413640155 - 2²⁹ = 21262876769243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21263413640159) 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, 14270746665 + ... + 14270748154.

It is an arithmetic number, because the mean of its divisors is an integer number (3210918167250).

Almost surely, 2^{21263413640155} is an apocalyptic number.

21263413640155 is a deficient number, since it is larger than the sum of its proper divisors (4423931697845).

21263413640155 is a wasteful number, since it uses less digits than its factorization.

21263413640155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28541494973.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 21263413640155 in words is "twenty-one trillion, two hundred sixty-three billion, four hundred thirteen million, six hundred forty thousand, one hundred fifty-five".