21253214635523 has 16 divisors (see below), whose sum is σ = 22895626965120. Its totient is φ = 19611882031104.

The previous prime is 21253214635501. The next prime is 21253214635529. The reversal of 21253214635523 is 32553641235212.

It is a cyclic number.

It is not a de Polignac number, because 21253214635523 - 2⁶ = 21253214635459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21253214635529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 581799323 + ... + 581835851.

It is an arithmetic number, because the mean of its divisors is an integer number (1430976685320).

Almost surely, 2^{21253214635523} is an apocalyptic number.

21253214635523 is a deficient number, since it is larger than the sum of its proper divisors (1642412329597).

21253214635523 is a wasteful number, since it uses less digits than its factorization.

21253214635523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50078.

The product of its digits is 1296000, while the sum is 44.

The spelling of 21253214635523 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred fourteen million, six hundred thirty-five thousand, five hundred twenty-three".