21253236622160 has 40 divisors (see below), whose sum is σ = 49569654622536. Its totient is φ = 8474476674560.

The previous prime is 21253236622133. The next prime is 21253236622181. The reversal of 21253236622160 is 6122663235212.

It can be written as a sum of positive squares in 4 ways, for example, as 2151197156416 + 19102039465744 = 1466696^2 + 4370588^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×21253236622160³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419005331 + ... + 419056050.

Almost surely, 2^{21253236622160} is an apocalyptic number.

21253236622160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21253236622160 is an abundant number, since it is smaller than the sum of its proper divisors (28316418000376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21253236622160 is a wasteful number, since it uses less digits than its factorization.

21253236622160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838061711 (or 838061705 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 21253236622160 its reverse (6122663235212), we get a palindrome (27375899857372).

The spelling of 21253236622160 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-six million, six hundred twenty-two thousand, one hundred sixty".