21838425815285 has 16 divisors (see below), whose sum is σ = 26438564844720. Its totient is φ = 17315777740800.

The previous prime is 21838425815273. The next prime is 21838425815287. The reversal of 21838425815285 is 58251852483812.

It can be written as a sum of positive squares in 8 ways, for example, as 9836760322321 + 12001665492964 = 3136361^2 + 3464342^2 .

It is not a de Polignac number, because 21838425815285 - 2¹⁴ = 21838425798901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21838425815287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29173685 + ... + 29912885.

It is an arithmetic number, because the mean of its divisors is an integer number (1652410302795).

Almost surely, 2^{21838425815285} is an apocalyptic number.

It is an amenable number.

21838425815285 is a deficient number, since it is larger than the sum of its proper divisors (4600139029435).

21838425815285 is a wasteful number, since it uses less digits than its factorization.

21838425815285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791608.

The product of its digits is 49152000, while the sum is 62.

The spelling of 21838425815285 in words is "twenty-one trillion, eight hundred thirty-eight billion, four hundred twenty-five million, eight hundred fifteen thousand, two hundred eighty-five".