21250142313445 has 8 divisors (see below), whose sum is σ = 25918206363000. Its totient is φ = 16721423459520.

The previous prime is 21250142313359. The next prime is 21250142313481. The reversal of 21250142313445 is 54431324105212.

It can be written as a sum of positive squares in 4 ways, for example, as 176331966561 + 21073810346884 = 419919^2 + 4590622^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21250142313445 is a prime.

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, 34836298570 + ... + 34836299179.

It is an arithmetic number, because the mean of its divisors is an integer number (3239775795375).

Almost surely, 2^{21250142313445} is an apocalyptic number.

It is an amenable number.

21250142313445 is a deficient number, since it is larger than the sum of its proper divisors (4668064049555).

21250142313445 is an equidigital number, since it uses as much as digits as its factorization.

21250142313445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69672597815.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 21250142313445 its reverse (54431324105212), we get a palindrome (75681466418657).

The spelling of 21250142313445 in words is "twenty-one trillion, two hundred fifty billion, one hundred forty-two million, three hundred thirteen thousand, four hundred forty-five".