21253110124446 has 24 divisors (see below), whose sum is σ = 46399919818824. Its totient is φ = 7030290880080.

The previous prime is 21253110124427. The next prime is 21253110124451. The reversal of 21253110124446 is 64442101135212.

21253110124446 is a `hidden beast` number, since 2 + 12 + 531 + 101 + 2 + 4 + 4 + 4 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21253110124446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4506594361 + ... + 4506599076.

It is an arithmetic number, because the mean of its divisors is an integer number (1933329992451).

Almost surely, 2^{21253110124446} is an apocalyptic number.

21253110124446 is an abundant number, since it is smaller than the sum of its proper divisors (25146809694378).

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

21253110124446 is a wasteful number, since it uses less digits than its factorization.

21253110124446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9013193576 (or 9013193573 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 21253110124446 its reverse (64442101135212), we get a palindrome (85695211259658).

The spelling of 21253110124446 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred ten million, one hundred twenty-four thousand, four hundred forty-six".