21250252463213 has 8 divisors (see below), whose sum is σ = 21648705306816. Its totient is φ = 20855190708000.

The previous prime is 21250252463179. The next prime is 21250252463261. The reversal of 21250252463213 is 31236425205212.

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

It is a cyclic number.

It is not a de Polignac number, because 21250252463213 - 2³⁰ = 21249178721389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250252463263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 847759448 + ... + 847784513.

It is an arithmetic number, because the mean of its divisors is an integer number (2706088163352).

Almost surely, 2^{21250252463213} is an apocalyptic number.

It is an amenable number.

21250252463213 is a deficient number, since it is larger than the sum of its proper divisors (398452843603).

21250252463213 is a wasteful number, since it uses less digits than its factorization.

21250252463213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695544195.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 21250252463213 its reverse (31236425205212), we get a palindrome (52486677668425).

The spelling of 21250252463213 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-two million, four hundred sixty-three thousand, two hundred thirteen".